It’s a recent change from what I am aware, I saw a spark mention on YouTube it because they changed it.
I should add that I’m not a spark and in terms of your own it’s impossible to say. I’d assume that the installer did it correctly.
That said even if it’s been wired into the CU it’s possible to bypass the RCD there as you normally would do if it’s built in to the charger already.
I was just flagging that the unit changed recently and that may change your install cost. There are a few different types of RCD and they don’t all meet the requirements for EV chargers so it may need to be swapped.