I saw this post on Reddit from a year ago where the Graphene mod account said that GrapheneOS will continue extended support as long as they are able. Are they still able?

Yes, but its important to understand what "extended support" means.

The following devices are end-of-life, no longer receive firmware or driver security updates, and receive extended support from GrapheneOS via a legacy branch based on Android 13 with only the Android Open Source Project security backports, certain other security patches, and other minimal changes to keep them working:

Pixel 4a (sunfish)
Pixel 4 XL (coral)
Pixel 4 (flame)

We provide extended support releases as a stopgap for users to transition to the far more secure current generation devices.

https://grapheneos.org/faq#supported-devices

    Probably9857 I see. I'll probably try to find a Pixel 8 or something then. Thank you!