Depends on where you put the perfect play ceiling. I think each side has good points in their respective favor. There have been strong pushes by both humans and computers in improving their best play in the past few years.
A 2 stone handicap, however, does not scale linearly with strength. It becomes relatively more impactful at higher levels. For pro players, 2 stones are gigantic, and for beginner players, they make zero difference. Same for a point advantage (komi adjustment). So there might come a point where it is physically impossible for a computer to beat a top human under some handicap.
A 2 stone handicap, however, does not scale linearly with strength. It becomes relatively more impactful at higher levels. For pro players, 2 stones are gigantic, and for beginner players, they make zero difference. Same for a point advantage (komi adjustment). So there might come a point where it is physically impossible for a computer to beat a top human under some handicap.