I don't know how creators, if they are able to, make their videos unavailable.
Note that Subscribe to Push Notifications sends a notification when a video of the tracked channel becomes private or unlisted or is deleted, for each of this case you will receive for instance:
<?xml version=\'1.0\' encoding=\'UTF-8\'?>
<feed xmlns:at="http://purl.org/atompub/tombstones/1.0" xmlns="http://www.w3.org/2005/Atom"><at:deleted-entry ref="yt:video:1RHxvM8mQS4" when="2022-10-24T13:39:07.99031+00:00">
<link href="https://www.youtube.com/watch?v=1RHxvM8mQS4"/>
<at:by>
<name>Test</name>
<uri>https://www.youtube.com/channel/UCv_LqFI-0vMVYgNR3TeB3zQ</uri>
</at:by>
</at:deleted-entry></feed>
For an unlisted video (such as 8c-AHRlzyJs
) you can retrieve this information from status/privacyStatus
using YouTube Data API v3 Videos: list endpoint with part=snippet
.
Graphically you would get:

For such a private video, Videos: list
won't return you any item for the given YouTube video id
(if you aren't using OAuth 2 by being logged as the creator of the given video).
For a deleted video you would graphically get:

For the video darZbXulSDI
you sent, graphically you get:

To distinguish both of them as they are both unavailable, you can use my open-source YouTube operational API. Indeed by requesting https://yt.lemnoslife.com/videos?part=status&id=VIDEO_ID, you would get whether or not the video was deleted by his uploader by reading item["status"]["removedByTheUploader"]
.
Note that as we don't know how the video went unavailable and as people are able to like the video without watching it, this may explains how the likes count exceeds the view count.