The run is of dredge

from 1:58:10 to 2:02:41

Killer is FarmerJohn (also has the 2nd spot of clown speed run)

https://www.twitch.tv/farmerjohn

Well, the clown run was submitted by FarmerJohn himself. If FarmerJohn thinks that this speedrun is submitting-worthy, he should cut out the speedrun part from the entire VOD and submit it himself. I guess that now the best you can do is contact FarmerJohn and tell him to submit this run.

I don't think we can submit it on his behalf 'cause the stream is his footage and we are definitely not cropping the run out and uploading it as a separate video without his permission..

Pretty much what Bo said.

We don't accept runs on other users behalves as we do not know you have the streamers permission to do so, which goes against Twitch's Content Sharing Guidelines.
Even if you did have permission if the streamer doesn't have an SR account (I know he does, but hypothetically if he didn't), we can't submit it under their name. We aren't supposed to change the names anyway due to collusion/fraud etc...

My advise would be to go back to said streamer and tell them to submit it themselves if you feel it is worthy.