No they don’t. Read the thread the OP linked. Not only did the Feat of Strength disappear from everyone’s Achievement lists, some of the people affected by this earned the Feat of Strength and no longer have the transmogs available to them. Blizzard confirmed this as a bug over three months ago and there’s no indication, an entire season later, that there will be a fix for it in 2.7.3
We’ve been asking for updates since…