When did Ex Gyms become Elite Raid Gyms?

It seems like it has happened since Diagla Raids. I love where I can reach a newly renamed Elite Raid Gym from inside my house.

For almost a month now it has only spawned 5 Star Raids. Not a single 1 or 3 or 4 star raid. This is from catching nearly 100 pokemon from only 5 star raid bosses.

I'm not complaining but I don't know if this is meant to be or if the gym here is somehow bugged and this is unintended?

Anyone else notice this change with the naming and spawning at these Ex Gyms/Elite Raid Gyms?