Don't raise our expectation that much but it is very much possible as HAL was super confident of putting all on jigs. Hope some news come up.I see. But if they're flown but not handed over to IAF, it'd be safe to assume that they were undergoing those changes (as we see SP-21, tail no 5017 in there too)... elsewhere.
So the ones in the video could be 24 & 26, 28, 30!!!?
Tail number can be old in that video as that is from april 2020.