Couple of things here:
The resolve effects step explicitly removes effects from models in play.
Buried models are explicitly not in play.
By the rulebook, this works, no forum rules involved.
Although if your LGS does not accept forum rulings and such, I'd suggest that the real issue here is your LGS, not anything else. All of these rulings can be found in the rules forum answered by marshals or Sketch, so do some searching and print them out maybe, or take a good mobile device gaming with you? Or just break out the fists and explain to people why they're wrong.
Not sure why. You were linked a ruling by the lead rules guy further up this thread that specifically states that this is how companion works. Not sure what more you want or what more we can give you?