It seems this is what the report refers to:
OP posted in that thread as well. It’s likely that this is just a case of the opponent acting quicker than the poster’s client can keep up with, as BigHugger described there, which isn’t a bug.
However, there have been reports recently of unscrupulous players tampering with their game clients to bypass animation delays and play much longer combos than would ordinarily be possible. Usually this is done with Snip-Snap, but it’s possible the same method was used to make this combo more effective as well. Seems unlikely that anyone would risk getting banned for a Tavern Brawl win, but Blizzard should probably keep an eye on Auctioneer and Miracle decks.