Kinda funny that Bavarian is more distant from 'High German' than Yiddish :D (not exactly wrong though, Yiddish is easier to understand for any non-Bavarian than hardcore Bavarian). There's at least a dozen local German dialects missing which are just as 'weird' as Bavarian though (PS: ok, all the main dialects spoken in the northern parts of Germany seem to be there, just in their own 'heritage node'), I guess Bavar…
« earned its own spot » Linguistically, this chart doesn't have much value. Not sure what criteria were used for inclusion of this or that item, perhaps just presence in some ISO standard. “German” per se doesn't mean much, so-called “high-German” („hochdeutsch“, meaning „oberdeutsch“ in opposition to „niederdeutsch“), the language that you and I speak, is an artificial synthesis and administrative compromise on writ…
You could have included Tyrolean, Viennese, or whatever which are all local dialects on par with "Bavarian".
These all belong to the Upper German dialects, as seen here:
https://en.wikipedia.org/wiki/German_dialects
Looks like this is just some Vibecoded app, with no real science behind it.