all his supers came off valid hit confirmable moves, so either he saw it hit and then it got rollback'd (which is possible) or he jumped the gun and just threw it out as a combo without hit confirming. not sure which. I know down medium is really hard to confirm online, which is why he did back fierce + fireball instead.
generally I just assume the best of the other guy when that kind of stuff happens. hit confirms are the one big area where 3s suffers online. it's just harder to hit confirm a lot of stuff.
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http://www.youtube.com/watch?v=npHDxSvwCE0