Such (pro)active denial usually indicates the denier has something to hide. Now that may not be the case here. But assuming you're right about this not being a Google problem but just small pockets like sexual harassment and racism.
Doesn't google still hold talks about racism & sexual harassment? I'm pretty sure they do. So why the voice against this talk, and this issue specifically?
If something bad is occurring inside Google, then of course it is Google's problem.
Whether or not it's ocurring I don't know, but to think that just because they have training materials saying something is bad and absolutely not to be tolerated means that it's necessarily in practice not tolerated is very naive!
The article doesn't suggest it is a problem unique to Google. It suggests that Google's efforts at DEI, which you are telling us are industry best, have a blind spot on this subject, as evidenced by the way they handled this situation. A story that sounds plausible to me.