All of this applies in the same way to the execution client. Should Go-ethereum, likely to be the majority execution client after the merge, produce an invalid block, it could get finalized and thus cause the catastrophic failure described in scenario 3.
Consider showing similar calculations for execution clients then.
According to the following article it is just as dangerous to run majority execution client: https://dankradfeist.de/ethereum/2022/03/24/run-the-majority-client-at-your-own-peril.html
relevant quote:
Consider showing similar calculations for execution clients then.