If this were the case Priority Pass would not need to have included these notices, they would simply notify us that these lounges were leaving the network. Instead, it sounds as if Priority Pass is creating a new membership tier "Select" which will exclude CO/UA, but will still offer some memberships which will include access to those lounges.
I think this must be right, although it's weird that they would introduce it in the lounge directory listings without making any other reference to it on the site. FWIW, I have sent an email to PP customer service inquiring -- no answer yet.