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I’d say both are wrong here.
Op should not use disposable emails as backup contacts information. Proton should have given warning before trashing everything on the account.
I’m not 100% sure I understood the whole issue, but I dont see why using an aliased email service (SimpleLogin, which Proton also owns) should be an issue? Its really not even a “disposable email” like TempMail or other services where the email is literally temporary.