I've read both ways about draining the radiator when changing the starter. Does anyone have any advice?

Should I drain the radiator? (recommended in this write-up: Replacing the Starter Motor (Best Way???) - Acura TSX Forum)

or

Should I plug the affected line? (recommened in this write-up: https://acurazine.com/how-tos/a/acur...starter-426733)

Thanks for your input.