Beating a Campaign

if one of my characters beat a campaign and then I delete that character, will I lose the HM option for that campaign until another character beats it?

According to the wiki, once the character logs in upon completion of a campaign, that campaign's Hard Mode should be unlocked for all level 20 characters on that account. However, it does not specify what happens once you delete said character. My guess is that since it is account-based, once unlocked it will stay unlocked.

When HM is unlocked on a lvl 20 character on a campaign uhm let's take factions you need another lvl 20 character on factions to unlock HM on him so its not for All lvl 20 character. I think.

Previously answered here.