White Fragility is an awful book. Even as baby's first guide to thinking about how you treat POC, it's a net negative and that role would be better filled by something like Ibram Kendi's books. Still fluffy and lightweight, but at least not as harmfully neurotic.
That being said, you've hit on the actual shortcoming of "woke culture" these handwringing articles miss. It's admirable, not outrageous, that white people becoming conscious of racism feel compelled to do whatever they can about it. But most people (in the US at least) are so depoliticized that their ability to effect systemic change is virtually nil. The project of rebuilding the necessary political capacity is hard, boring work and we probably won't live long enough to see its fruits. If you want gratification, making some rando on the internet bend the knee is much easier.
One definitely gets the impression from critics like the author that they're less interested in seeing that energy redirected than in it dissipating entirely.