That's a nice article, all the casinos listed there are trusted sites. But some of them have a complex provably fair engine.
I don't like the sites who have a shared nonce and not an individual one, to be more clear, some casinos use the total number of bets on the casino to estimate the bet result while others use the total of your own bets.
Can you give me one of the example of the casino using this shared nonce method? I wasn't able to fully understand which site or provably fair mechanism you are referring to. If you could give me the name, I can look into it in detail and determine whether the provably fair script of such casino is actually fair or not. If not then I will notify about the same to the casino and insist them to improve the same.
Also, the article is written by me but the list of casinos is added by BTCGosu (@efialtis). But like you said all of them are trusted so I guess efialtis has done adequate due diligence before adding them to the GOSU. Nevertheless, if I found discrepancy in the script, I will inform about the same to efialtis too so that he can remove the said casino from the list.