https://twitter.com/ppleskov/status/1215983188876709888?s=19
The person was originally employed at h2o.ai and as a consequence of this was fired. Not sure if that was completely appropriate.
Wasn't this a personal participation? Or are there "company teams" on Kaggle ?
In my opinion, keeping him onboard compromises h2o.ai's image as a trustworthy AI company. To many people, AI is magic, so the last thing you want is the impression that the magic is really a con.
He has only been at h20 for a few months.
He was almost certainly hired at least in part because of his participation in the contest.
If you admitted to cheating on your degree, and your university found out and revoked your degree, then you'd probably expect to get fired from your job if you no longer have the qualification you said you did. Being a top 10 kagglester is a qualification (and a highly prestigious one at that).