As a mobile developer, I can see it as pretty narrow minded, not particularly offended but it's hard to deny there isn't a certain subset of developers and gamers who like to sneer at everything mobile.
It doesn't really bother me, most of the time I think it's dumb, especially for developers who are just thumbing their nose at a massive market.
It kind of pretends that non mobile developers are very virtuous people who make wholesome and good games. And no pc software has ever existed that isn't predatory, spammy or outright malicious like that isn't something that hasn't existed on desktop for decades longer.
If godot would want to expand their source of developers to include mobile games, then it probably isn't a good idea to insult them.