Patsy Ryan was a pretty high profile guy around that time so I would think that Scarpa would have known if this switch to the Colombos actually occurred. But there is nothing in Scarpa´s files that says this. (If it has not been redacted that is.)
What you could do is ask the poster (if he´s still active) what his sources are. Some sources are more creditable and reliable than others.

I would think that Patsy Ryan changed crews within the Genovese Family after his brother´s death and after being demoted. So he might have found himself under a different captain than Gigante, who took over the crew. This could be the source of the confusion. But I have never came across any reliable info saying he switched Families.