Apps do indeed have to have unique names. If a desired name isn't available, developers commonly solve the problem by adding a bit of description to the name, making it unique, e.g. "SuperText - Text Editor for Geeks" when "SuperText" isn't available.
Until recently there was a significant name-squatting problem, with devs creating placeholder apps that tied up names indefinitely. Apple cleared all of those out last Fall, making a large number of names available again. Now an app created in iTunes Connect but not submitted for review will receive a warning after 150 days and if there's still no submission 30 days later, the placeholder is deleted and the name is freed up to other developers (as per the policy you quote). Significantly, that specific name is no longer available to the developer that first used it, so be certain you're going to submit soon after creating the app in ITC.
As to approved and then later renamed apps, I don't know what Apple's policy is, and it's not spelled out anywhere that I've ever seen. I think it's somewhat unlikely that the old name becomes available due to potential consumer confusion, though: "I bought 'Buddy's Checkers' but now it's saying that I didn't buy it."
Note: Updated from 90 days to 150 days, per Apple's change. See "App Name Expiry" in the iTunes Connect Developer Guide.(thanks to Alexander)
As an aside note: Apple has recently extended its 120 day limit to 180 days. It means that if you don't upload a binary within the 180-day period, your app is deleted from iTunes Connect. As a result, you cannot reuse the app name, SKU or bundle ID. See more details in the App Name Expiry section of the iTunes Connect Developer Guide
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应用程序确实必须有唯一的名称。如果所需的名称不可用，开发人员通常会通过在名称中添加一些描述来解决问题，使其唯一，例如，当“SuperText”不可用时，“SuperText - 极客的文本编辑器”。
直到最近，还存在一个严重的名称抢注问题，开发人员创建了无限期绑定名称的占位符应用程序。去年秋天，苹果公司清除了所有这些名字，使大量名字再次可用。现在，在 iTunes Connect 中创建但未提交审核的应用程序将在 150 天后收到警告，如果 30 天后仍然没有提交，则占位符将被删除，并且该名称将被释放给其他开发者（根据您引用的政策） 。值得注意的是，该特定名称不再可供首次使用它的开发人员使用，因此请确保您在 ITC 中创建应用程序后立即提交。
至于批准后重新命名的应用程序，我不知道苹果的政策是什么，而且我见过的任何地方都没有明确说明。不过，我认为由于潜在的消费者困惑，旧名称不太可能可用：“我买了‘Buddy's Checkers’，但现在它说我没有买。”
注意：根据 Apple 的更改，从 90 天更新为 150 天。请参阅iTunes Connect 开发者指南。 （感谢 Alexander）
Apps do indeed have to have unique names. If a desired name isn't available, developers commonly solve the problem by adding a bit of description to the name, making it unique, e.g. "SuperText - Text Editor for Geeks" when "SuperText" isn't available.
Until recently there was a significant name-squatting problem, with devs creating placeholder apps that tied up names indefinitely. Apple cleared all of those out last Fall, making a large number of names available again. Now an app created in iTunes Connect but not submitted for review will receive a warning after 150 days and if there's still no submission 30 days later, the placeholder is deleted and the name is freed up to other developers (as per the policy you quote). Significantly, that specific name is no longer available to the developer that first used it, so be certain you're going to submit soon after creating the app in ITC.
As to approved and then later renamed apps, I don't know what Apple's policy is, and it's not spelled out anywhere that I've ever seen. I think it's somewhat unlikely that the old name becomes available due to potential consumer confusion, though: "I bought 'Buddy's Checkers' but now it's saying that I didn't buy it."
Note: Updated from 90 days to 150 days, per Apple's change. See "App Name Expiry" in the iTunes Connect Developer Guide. (thanks to Alexander)
顺便说一句：Apple 最近将其 120 天的限制延长至 180 天。这意味着，如果您未在 180 天内上传二进制文件，您的应用程序将从 iTunes Connect 中删除。因此，您无法重复使用应用程序名称、SKU 或捆绑包 ID。请参阅 iTunes Connect 开发者指南
As an aside note: Apple has recently extended its 120 day limit to 180 days. It means that if you don't upload a binary within the 180-day period, your app is deleted from iTunes Connect. As a result, you cannot reuse the app name, SKU or bundle ID. See more details in the App Name Expiry section of the iTunes Connect Developer Guide