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And that has nothing to do with what the OP is talking about.
OP, there are too many reasons for why games could be showing up like that. Such as if you're in Germany, distribution rights for the publisher might have expired, distribution rights might have transferred to another publisher that doesn't wish to sell on Steam, the publisher / developer may have gone out of business and chosen to remove their library from sale, and so on.
Google Steamdb appID# from the URL you copied.
https://www.heise.de/en/news/Steam-Why-some-of-the-best-indie-games-will-soon-be-hidden-in-Germany-9960810.html
Someone didn't read the opening post properly
The reason games get removed vary, often its due to copyright on IP but lately as the other person mentioned many are to do with new laws in Germany and the developers not updating their game store to suit.
Still nothing to do with the OP's question.
You didn't lose access to any games due to regional restrictions unless those games imposed their own IP block on their end. And that only tends to happen with MMOs sold out of region -- at which point, you inform Steam support and they will remove the game from sale in affected regions. And if you've owned such a game for less than 2 weeks with less than 2 hours played, you can get a refund.
The only other reason you've "lost" games at no fault of your own is because their servers shut down. That's been a thing since the dawn of MMOs. If a game without an online requirement is removed from sale, previous owners will still retain access.
The requirement for potential different launchers has also always been a possibility (read the licensing for once!) and will not cause you to "lose" your game, unless you've messed something up on your end.