Trust me, I've been there and done that. I know from first hand experience how it works. Before my Nexus 6 was whitelisted, I wanted to get a new SIM card. My previous device had a micro SIM so I cut it to nano size so I could use it. Later I wanted to get a real nano SIM. I went to a Verizon store. However, they couldn't do anything because my phone was not whitelisted. I went home and grabbed a Verizon Moto X (2014) I happened to have at the time, and went to Verizon again. They activated a new nano SIM on my Moto X, I inserted it in my Nexus 6, and I was good to go. One of the Verizon employees even wanted me to put it in my Nexus 6 there at the store so she could see how it works!
Right. We are saying the exact same thing. You can get your non-Verizon phone to work ONLY if you trick the Verizon network into accepting your phone by first having the SIM card in an already approved phone. That's exactly what I have been saying too.
Your implication when you started this tangent of the thread (as I understood it) was that the Nexus 6 ITSELF is somehow enough to be on the Verizon network. It is not. You can not go and get a brand new Verizon subscription for your non-Google Play, non-Verizon Nexus 6 unless you already own another Verizon phone (or, as the article suggests, you go into a Verizon store and copy an IMEI from a Verizon phone and then do it online using an IMEI to a phone you don't own). Thankfully, Verizon has left open a loophole for some customers.
For non-Verizon Nexus 6 phones that HAVE been bought from the Google Play store, Verizon has whitelisted them, so you don't have to do a workaround. This is what Microsoft could have done, I assume, and what Verizon possibly might have declined to allow. I don't think Microsoft should've made policy based on a possible loophole in Verizon's whitelisting method.
We're basically saying the same thing, except I am emphasizing the fact that to be truly allowed on the Verizon network, a phone has to be approved by Verizon. Otherwise you can just hope that there's a workaround.
And of course, if the 950XL doesn't have CDMA it's irrelevant anyway whether there's still a loophole or not.