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Apple doesn’t tend to hand out their logo for industry groups and open source projects. That’s fine, it’s their support that matters. And it’s not like their name lacks brand recognition!

Here’s another example; same idea, different font:

https://aomedia.org/membership/members/

They have been a principal organizer and sponsor of the LLVM Developers Meeting for years and even then they did not use their own logo.

They do occasionally: https://ghc.anitab.org/2019-sponsorships/corporate-sponsors/

I feel like this violates Apple's brand guidelines..

On the contrary, by not using the brand at all it ensures that third parties are not in a position to violate Apple’s brand guidelines.

That's totally Myriad Pro.