I have no dog in this fight, but I agree with the "smear campaign" that this is 100% bullshit. I work for a fully remote company with employees from all over the world, including Eastern Europe, and we didn't need to partner with any local company, let alone a competitor. Plus even if we need local HR assistance there are plenty of global/local HR services to choose from that focus on HR, no "employee sharing" needed.
I don't know if any other claims are false, but this kind of bullshit obvious to anyone who has been in a similar position undermines everything else they claim. Plus it was never mentioned what these "local partners" get in return, which seems to be the most interesting thing if there's no secret ownership, which is the thing they set out to debunk.