In many senses there's hubris in the western* view of China accomplishments: most of what western companies have created has had significant contribution by Chinese scientists or manufacturing, without which those companies would have nothing. If you look at the names of AI researchers there's a strong pattern even if some are currently plying their trade in the west.
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* I hate the term "western" because some "westeners" use it to separated what they think are "civilized" from "uncivilized", hence for them LATAM is not "western" even though everything about LATAM countries is western.
I don't think you can really produce a definite counterfactual that they would or wouldn't have taken longer or shorter without it, but certainly they were pushing for self sufficiency long before technology restrictions. But we're not going to be handing our technologies to our competitors on a silver platter, and it's also best for businesses to start weaning themselves off the Chiinese market. Virtually every market reliant on them today is in big trouble.
As for hubris, I think that's more a projection of your part if you want to start bringing up race cards with regards to contributions, that kind of argument would be applicable to everyone. And AI research is highly diverse and international, Chinese names don't dominate the list more than Turks, Greeks, Malaysians, etc.