I think so… I’m new to this too. Here’s what I get from it ... so far… and the good news is, if I’m wrong someone will come correct me.
First, for sure, you need the Poser DSON importer installed to your Poser directory. You should also install the new genesis files to your genesis content file. Once there, any genesis “figure” installed will load into Poser as long as there are DSON companions installed ... from what I gather… anywhere. (haven’t quite figured that part out yet, but apparently the companions just need to be installed “somewhere”).
Edit: Then, for sure, you have to add that content runtime to your Poser runtime if you haven’t already.
Now, more about those DSON companions. Either you can download them from Daz, if the creator has created them, or apparently, if you own the latest Daz Studio, you can export them yourself. I haven’t actually gotten to the point where I have created any companion files. But I have installed the genesis files and have found that all the morphs (including my genx morphs) are available when I load genesis in Poser.
Hope that helps get you started.