I spoke to Reallusion, and it confirms that the original posting is true : You can engage with clients to sell models, so long as neither you or the client distribute/redistribute the models onto 3rd parties (like other entities or websites)...and you are good to go. Be sure to include a clause in your contract with the client that states that if they violate any of reallusions terms (like redistributing assets to a library) that they will be held in full liability.

Cheers everyone.

I'm new to RL (CC4) and find the license terms to be VERY confusing.  This thread helps but it would be nice if RL simplified their terms.  Or maybe clarified with some examples. 
It is disappointing that we cannot sell our creations on other platforms such as ArtStation, Sketchfab, and the UE5 Marketplace. 

--DRLarkin