I mean the Forsaken are part of the Horde. I don't think the writers need to spell out the obvious every time they reference the obvious.
The Forsaken helped, but Thrall and the rest of the Horde accepted them in the end. The BEs are indebted to Forsaken aid and the others' indifference/tolerance. So yes in summary, the Horde. It's not a lie to say as such, or ignoring the warmer bonds they had in the past. Lor's consideration for her past efforts has already been mentioned during the heritage armor quest and even by his line, "one whom I once knew well". Talanji says she owes a lot to the Horde, but I don't see you bitching she should be specifically thanking 'Baine'.
This just reminds me of the heritage armor datamining, when half the thread was blatantly lying about events to push an agenda. Smh You guys don't even have real complaints, you just want to be mad.