Truly incredible that I can watch the replays of any SF6 online tournament match to look at players' exact inputs. I was curious if Dual Kevin was mashing super during burnout to interrupt Marv's string and I was able to see that no, he actually reacted to the (tiny) break in pressure and input the whole thing absurdly fast.
Wow, I tend to get panicky during burnout and do really dumb stuff, but to keep calm and react with such precision is insane!

Where are you finding the replays with inputs from? I know top 8s are usually streamed, but do they upload the replay files somewhere else or something?
Go to Multi-Menu -> CFN -> Replays -> Search and search by player tag. I'm not sure how long CFN will hold a replay but assuming the matches happened very recently it should pop up. There may be better ways to search for replays of matches that happened a longer time ago but that's the method I used.