I think something like "Is it actually reasonably possible to build something usable from the parts that are Open-Source?" Is not a bad line in the sand, though it's not a very clean one.
You can quibble about it generally, or talk about case-by-case specifics, but your outrage seems a bit out of proportion, it's a reasonable position to take.
At a time when none really existed. Not even close.
They also went out of their way to generate open drivers and rewrite those where vendors would not give them some, and ensure they had contracts that let them do so.
Calling this open core is also insane even if it wasn't a retcon. At the time, >95% of all android code in existence was open source. Probably closer to 99%. The remaining pieces were mostly related to prototype phones that never saw the light of day.
How is it possibly "less misleading" to call this release "open core"?
How it is a reasonable position to literally accuse them of bad faith because the parent didn't think it "useful enough"?
Admittedly I think open core is just a definition someone made up to beat others over the head with for "not being open source enough", so I wouldn't use it anyway[1].
But here, moving the goal posts because it didn't include whatever particular piece the parent wants does not make it a reasonable position, and it definitely is not a reasonable one. Nor is the completely unsubstantiated bad faith accusation.
My outrage is because i tire of watching people tear down things and literally accuse folks of bad faith because, 20 years later, they decided it wasn't good enough for them. The fact that this doesn't outrage more people says a lot more about how the open source community behaves than it does about android.
If this is the bar for reasonable positions, it's a really crappy bar.
[1] FWIW - while i was not always, i'm fairly consistent these days in believing that all the forms of trying to shit on open source releases or come up with no-true-scotsman terms to use for not being "something" enough are a plague, regardless of whether that something "accepting features that i want" or "releasing pieces that i want" or whatever. The sense of entitlement involved is often impressive. Was it released under an open source license? Cool it's open source. Period. I'll just be thankful someone took the time to share and use what ever they did share to build cool things. They don't owe me crap.