More likely driver optimization than frequency changes in your case.
As sold, 2250Mhz.
https://www.asrock.com/Graphics-Card/Intel/Intel Arc A380 Challenger ITX 6GB OC/
I have one, but I don't use it for gaming so much, just experiments and media playback. My test platform to see if I will jump on Battlemage when it comes out.
The only ASRock 2000Mhz version was only recently released and is the low-profile one that doesn't require external power.
I don't think the Intel card was ever sold in the US, and we also only recently saw Sparkle and Matrox start selling Intel cards. Acer sells only the large cards.
I may install that driver later and see what happens, would be annoying if it downclocked it to 2150Mhz.