Vod of a parkour guy watching it (40:25)
Summary: Dream was defo using a macro in MCC 11 during Parkour Warrior that autojumps off a block at the last possible tick. Easiest evidence is the fact that he always jumps last possible second, AND he never runs off the block like you would expect someone who actually is trying to wait till the last tick before jumping would EXCEPT for one time. And the streamer linked theorizes that he turned it off, because he hit a wall and it made him jump off a cliff. So then he tries again but runs off. Then turns it back on and suspiciously tries verrrrrry hard to avoid the walls.
For Comparison, when the streamer watches MCC 10 at the beginning he notes that it looks much more normal and realistic. Up until we get to the end of the course where it looks like he's maybe turned the autojump cheat on again and flawlessly does the salmon ladders (which are apparently extremely easy when you have an autojump cheat!)