I doubt they're benchmarking things properly. Most likely some flawed "ad blocking speed" that doesn't measure ads and tracking scripts that are loaded / parsed etc.
Not even sure it's a valid comparison; are you even an ad blocker that can be compared with another ad blocker if you don't block ads properly. You can get a lot more speedup with an ad blocker that blocks nothing. Ad blocking speed would be 0 microseconds :P
uBlock Origin Lite still blocks ads on Chrome, but it's faster than uBlock Origin.
I don't expect Google's ad revenue has changed meaningfully at all, assuming people switch to uBlock Origin Lite.