My understanding is that, while plants thrive overall, higher CO2 in the atmosphere is expected to “dilute” the nutrients in farm crops because they will grow too fast[0]. These nutrients may already be impacted by industrial agriculture practices[1]. So it’s still not good news for humans.

[0] https://www.nationalgeographic.com/culture/article/140507-cr...

[1] https://news.utexas.edu/2004/12/01/study-suggests-nutrient-d...