That’s pretty weak, as my 2017 MacBook Core m3 scores within 10% of that. However, I predict the MBA will score higher, once we have more tests, since GB 4 results can vary a fair bit, esp. when lots of stuff is running in the background.
My prediction is around 4500/8500... which is what the 2017 MacBook Core i7 can get. Why? Cuz the i5-8210Y is effectively akin to a rebadge of the i7-7Y75 running at 7 W. Basically the same specs, including both the base and turbo clock speeds at 7 W.
The i5-8210Y MBA with fan should do better at sustained performance, but if that’s what’s you need you should think hard about getting a thinner refurb MacBook Pro.
BTW, at 7 W, the 8200Y is actually superior to the 8210Y. Higher turbo speed.