Have the ranks changed this badly?

I played rocket league on a daily basis 2 years ago and consistently ended the season between champ 1 and champ 2.

That's when I quit and lost interest. I came back to this game 2 weeks ago and after having played for 2 weeks, I'm struggling to stay in diamond 2... I don't really notice any big difference between my gameplay now and gameplay at my peak so my question is...

Is diamond 2 the new champion 2?

I know there can be rank shifts when they add new ranks like they did with SSL, but this was way after that...