Actually a really strong signal is an action that is a sacrifice, regardless of whether it has a real positive impact.
A few people I know, when discussing this story, know Linus mainly as the Linux kernel developer who writes long insulting e-mails to people who's posts he doesn't like. The "retroactive abortion" seems particularly famous.
I'm not saying this is fair, given the massive and positive effect of the Linux kernel, but that doesn't stop it being true (based on my tiny sample).
It's truly sickening that the truth about diversity, inclusion, and equity is so muddled that even Linus can be deceived about it's nature. Fundamentally, the D.I.E. values are racist, Marxist, anti-capitalist, anti-merit, anti-competence at their core, and they pose a significant threat to modern working culture. Their threat is mostly their guise of compassion.
And here is a perfect example of why so many people are alarmed by his CoC adoption. This. The idea that community leaders must make institutional changes to signal that they - personally - arent's "the disgusting underbelly of the internet". Pause and think about it.