You all remember just a few weeks ago when Sony ripped away a bunch of movies and TV shows people “owned”? This ad is on Amazon. You can’t “own” it on Prime. You can just access it until they lose the license. How can they get away with lying like this?
If they have access to remove the media from your library on their end, then it’s a license and not a purchase.
That doesn’t mean they don’t owe you access to it, though. The fact that there isn’t a word for “I’ve acquired perpetual access even if I can’t back up the file itself” doesn’t mean you shouldn’t have the right to continue to access the media. Or to demand that right to be upheld in court, for that matter.