The guy who wrote the article has experience in a combat zone and has seen more military action than he will ever have.
I served in the US military around the same time period this guy did. I was on active patrol. I worked with contractors. Does that make me qualified to discuss the potential leanings of a private mercenary army in Russia?
No. It sure as fucking shit doesn’t. I could comment on signal propagation or beam formation, or heterodyning, or many other things. But I would be unqualified to speculate on all things ‘military’, such as relationships with mercenaries. The author made a speculative point that I think warrants criticism, and based on the limited information about their background, I don’t think is particularly well informed.
Its make a critical reading of things because its too easy to make colorful or convenient assumptions.