No it never was about collusion and really could never have been. Everyone fails to recall that no one actually believed that Tump could prevail. Which implies what can be best descibed as mischef making and these guys were the easiest targets even though it all amounted to the famous nothing burger.
That private citizen Trump sold real estate to rich criminals who occasionally were Russian is expected. Their privacy happens to be important as well. And we can be certain that all such tansactions were lawyer to lawyer and face time was unlikely even then. That is what you have salemen for.
Did he sell condos to Russians - i hope so!.
As this item makes clear this was only Russian mischef making top to bottom and then likely leaked to Hilary as well.