They said they started working on millennium problems after hearing a rumor someone had found a solution to one of them. That's just bad taste. It indicates negative motivation rather than positive motivation from the start.
Truly, if this is the biggest criticism left, they should be celebrated. While in reality, all of this has a bitter aftertaste.
So weird.
That does stretch the reader's credulity. I think most people find it far more likely the rumor was related to Anthropic all along.