Remove those games (both rated and casual) from Profile/losses, the personal opening explorer, chess insights and "Worst rated defeats".
Games lost to stronger-than-GMs engines shouldn't be part of our numbers.
https://lichess.org/forum/lichess-feedback/please-remove-cheaters-from-the-worst-rated-defeats-list#5
Btw it's not just cheaters but also sandbaggers - I recently got one in my bullet list
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