Assisted Property Investments -A way to dodge the salary cap?

[Denton Rovers RLFC]

So I was reading this piece https://www.theguardian.com/sport/blog/2019/apr/16/rugby-key-decisions-israel-folau-billy-vunipola on RU by Robert kitson in the Grauniad, it says

 "Take the salary cap, for example. There is insufficient space here to examine all the financial niceties but, basically, Premiership Rugby is examining whether assisted property investments entered into by several leading Saracens players are actually benefits in kind and, as such, should be included under salary cap regulations."

Now this got me thinking, is this what happened with Hull FC last season when it would seem several players including Sika Manu and Mark Minichello were allegedly according to several people on the black and whites  RL fans page https://forums.rlfans.com/viewtopic.php?f=34&t=621329&start=110 involved in getting extensions to their contracts only on the back of the fact that their investments in the clubs main sponsor 'Goldthorpe properties' fell through/was a bust?

If this is what actually happened, that it was a way to circumvent the salary cap and basically partly pay players in 'profit' from an assisted investment venture such that the profit from the investment would not have to be counted on the cap/as salary, then that's pretty shady to say the least, not to mention fraught with danger for clubs and players.

[North but south]

Didn't Rangers almost disappear over something similar? I'm Sure the Tax man won in high court and bankrupt them.