I've never played Hearthstone so have no idea about the validity of article.
Although this line had me crack up:
"A lot of frustrated aggro players have taken to calling Antique Healbot a "broken" card. Which is patently absurd. A company with the reputation and resources of Blizzard isn't going to allow a card that genuinely ruins the game through the playtest process."
No company, or set of playtesters, is perfect. Games let broken things in all the time, then they get nerfed/fixed. Hearthstone is not somehow immune to accidentally getting an unbalanced card --- or, more likely, having a new card produce unintended effects once it goes live and some random player comes up with a new tactic no playtester thought of.
Again, I'm not talking about this card, I have no idea. It's just laughable to think Blizzard is immune from making a mistake like that.