The guy was an idiot, granted, but he was seriously asking for help. Joke or not, it was something I'd refrain from ever suggesting.
It wasn't what Sebur suggested, it was how, that got him banned.
Supply an idiot with the exact things to do and they will do it, not knowing the consequences.
An idiot won't know what fdisk means, but they'll give it a try if its supposed to be able to fix their issue.