I think people have read so much corporate PR posts they think that is a rule of how to post online.

This post is his personal blog, he is a human writing what he thinks.

If this was a tweet people would be fine with it, but it is a blog so he should make it corporate-y

"If this was a tweet people would be fine with it"

Actually, some folks do care about how the leader and public face of a project conduct themselves regardless of venue. If a different public figure ie some CEO wrote something reprehensible about some particular ethnic group, is it more excusable or forgivable if they did it on their personal social media account rather than the company blog? Same basic thing.

Public writing in a personal space is still public writing. Being held accountable for publicly stated views is an inherent part of sharing them in public, no?