AFAIK it is using the onboard SM502 without hardware acceleration. I dont know if any r200 video cards are supported on this board yet. On the other hand you dont need another SATA controller to install/use MorphOS on this machine.
I got the impression from the video that they must be running SM502. It's really weak and benches around the same as a Permedia 2 on an A1200 in GFXBench2D.
Shouldn't the R200 driver work out of the box anyway. Despite that I think it makes sense to support the lowest common denominator since not every Sam460 owner will have an R200 card.
This is a very early alpha and could be some time before a release by which time MorphOS might well be supporting cards cards newer than R300 anyway.
I look forward to seeing more details on this project.