There's no HA/TMA thing. HA was conceived, designed and fashioned here on TMA by nearly a hundred TMA Members.
There is now an HA v "A group of sockpuppets comprising TMA ejectees" thing which is quite different.
That may well be the case, I'm sure. I've no actual knowledge of HA or that much of TMA or it's history, internal politics etc. I just regard myself as an occasional independent contributor.