It mostly is.
See also this thread on the same topic:
The major difference between these two threads is that ‘Reithardt’ is at the very least a character on a Hardcore server, so the individual behind the avatar at least has played some HC – unlike ‘Henceforth’. So there’s some credibility, but still not enough. Somebody who actually has a Level 60 character on a Hardcore server (looking at you, Eyr) who earnestly believes that Flask of Petrification is deleterious to the end-game on a Hardcore server would at least be able to demonstrate that they have walked-the-walk.
Slaying Nefarian isn’t really necessary and there are enough guilds that have Molten Core on farm that a Level 60 HC character (even if they haven’t actually raided) is at least speaking from a position from actually playing Harcore at the end-game unlike Henceforth in his thread, or Reithardt in this thread.