At this point Blizzard, we understand you aren’t going to honor what you essentially advertised for 3 months.
But at the VERY least, you owe us an explanation.
Even if it’s as simple as “We are sorry. A developer accidentally labeled the achievement for any difficulty and it was not caught until last minute” (Though if this really is the case, a note that you will try to include rewards for LFR players in the future would be nice as well)
The silence on this matter is just making it worse at this point. This is one of the biggest drama situations in years and ignoring it is not helping.