Here's some helpful perspective, gleaned from experiences in many areas of tax & financial, without addressing the specific company and trademark that are being discussed.
Establishing a 401k/QRP for someone that doesn't qualify can entail tax risks that greatly outweigh any purported benefits of 401k/QRP. Any provider that promotes a specific course of action w/o informing you of the risks presents multiple issues:
1) Such a company is not focused on you; they are focused solely on your credit card.
2) 401k, QRP, SDIRA, LLCs, tax, asset protection, etc. are areas of complexity and you can't possibly identify every risky tax position and protect yourself. The best you can do is find a provider that aims to inform you of any-and-all pros, cons, & risks.
3) Whenever the IRS does start targeting abusers, you don't want to be riding on the leaky ship with the big bullseye on it.
The upshot of all this is that for anything tax related, find someone that's focusing on you and trying to help - not someone promoting a one-size-fits-all approach.