That could explain it - but it was such a total deletion I thought maybe a legal issue. If it was Covid you might expect 'Sadly Dave can't continue, so reserve Ken will be taking his place' etc.
I read on the Twitter, so it must be true, that the contestant had a row with the judges and flounced.
I suspect that if you do behave badly on the professional series they don't want to give you any publicity, whereas they'd leave in any aggro during the amateur series.