I think the point is that it is retiring the full featured v4.3 and replacing it with the Beta version that is missing features - the big one for me was that I couldn't share my screen.

Yeah. The link in the FTA takes me to Skype download page and trying to install the deb file says that the version is 5.3.0.1. The notice on that page only says :

> All Skype for Linux clients version 4.3 and older will be retired on July 1, 2017. To keep chatting, please install the latest version of Skype for Linux

Seems like 4.3 and older will get retired, but Skype will continue to work on Linux with later versions like 5.3.0.1