I can confirm that with this mod, getting even 4 wonders done is way harder (I wasn't able to get 7 even when focusing hard on them).
AIs build wonders in 2/3 turns and just rush for them.
I was thinking I'm just bad with culture legacy path, but when I tried vanilla for the first time in many months, I was shocked that I was able to complete the cultural legacy path for the first time

I don't think wonders rush benefit them too much, though. Since when you win a war, they're quite often willing to give you that city with 5 wonders.
All of it is about playing on Deity, of course.