Yeah, we suspected him as well when he submitted all those impressive stats. Luckily, he joined #soniccenter. He said that he had been talking with Sprint and copied there part of their conversation:
[19:41:07] <Teh_Sir> <Sprint> basically a trick you can do is to do the previous level first
[19:41:13] <Teh_Sir> <Sprint> you basically need to time your death or end the previous level so it happens just after a second ticks over
[19:42:12] <Teh_Sir> <Teh_Sir> I noticed just dying also helps
[19:42:12] <Teh_Sir> <Teh_Sir> And restart the level that way
[19:42:12] <Teh_Sir> <Sprint> yeah or that
[19:41:26] <Teh_Sir> That's basically how I'm able to pull those low times
Then we asked him to record a time attack of one of the acts. He provided a video and we concluded that he was legit.