Apache isn't a copyleft license. I guess they (and everyone) can just copy or compile it, make it a derivative work and say it's now non-free and terms and conditions apply.
I mean the GitHub repo has a license file which says it's Apache 2.0. And 3h) of the EULA says it doesn't apply to open source components. So it kinda doesn't apply to itself. I think you're right, it's Free Software after all and them saying "Some builds [...]" means it's the binaries distributed by them. IANAL and it kinda contradicts the Apache license which explicitly states I am allowed to redistribute copies both modified and not modified and both in object and source form. I'm not sure why they do it and if there are components missing in the GitHub repo.