To be honest, I have no clue how to read OpenWRT build configuration. I can not make any sense of this device having moved from p1010 to generic, nor of not having no generic folder there in 22.03 RCs.
What does that mean for the upcoming 22.03 release? Can I still hope for this device to be included?
FYI, the snapshot images you found are old images (May 18th). That day the WDR4900 images were disabled, so the buildbot hasn't built any newer images. I suppose the images still there is an oversight, looks like they get replaced rather than removed. I was a bit surprised to see master images, since on master it's disabled just like on 22.03, but the date of the snapshot image matches the date the builds got disabled...