Their post history has several posts related to PostmarketOS on the Fairphone, so kind of, possibly? pmOS does have Waydroid to run Android apps, though, which also relies on AOSP.

Waydroid can't run nearly as many Android apps as AOSP on bare metal or especially GrapheneOS with the compatibility features it provides. It's an approach with far more limited compatibility.

Waydroid has very poor privacy and security due to disabling most of the app sandbox. It's also based on an old version of LineageOS so it's missing many important privacy/security updates, but it's much more relevant that it doesn't have SELinux and exposes much more kernel attack surface to apps. SELinux is not an extra layer of security for Android but rather is used in a far more deeply integrated way than any typical desktop/server usage. It's a huge portion of the security model including the app sandbox and protecting the Linux kernel.

We greatly prefer virtual machines over a half-baked container approach disabling most of the privacy/security model. There's already hardware accelerated virtualization on all of the supported devices for GrapheneOS and we plan to make a lot more use of that in the future.