This also happened to me today when trying to join the server for the first time...if I use the DayZSA Launcher (the app) it freezes exactly the same as the screenshot OP shown.
But if I try to launch DayZ through a launcher (with right mods and my character's name), add "dayzrp.com" to filters, it only shows the EU server with 0/60 players, not the actual server (which was at 65/100, definitely not full, as I checked with DayZA Launcher).
I'm not sure, maybe it takes some time for a database to update, since I'm a fresh whitelisted newcomer, maybe that's the issue? I also tried reinstalling the game, redownloading mods, verifying my cache files and restarting laptop.
All the other servers, moded or not, are working so I believe there might be something with me not being registered as a whitelisted person, but I'm just guessing.
Anyone can help?