It's kinda shitty, but after reading the other links in the post I can't say it's very surprising.
Bottles devs seem weirdly hostile to the idea of anyone repackaging their software, because apparently they're the only ones that are able to do it properly.
edit: devs also refuse bug reports from any version that's not Flatpak, so in this context removing the button doesn't seem that unreasonable.
edit2: now that I've had a closer look at the PR mentioned in the post I'm not surprised at all.
Bottles devs are actively hostile. Apparently with this PR it's impossible to run Bottles outside Flatpak without the package maintainers patching the code.