Feel like this is just getting weirder. Obviously no one actually cares about the certificate signing issue - thats just what let everyone know that an ownership change had occurred. Why would anyone need to "verify" that this post is from Ben, and why is pointing to another domain which could have also been transferred to the new owners proof of anything.
I mean hell, compare that post to this old blog post
https://www.macbartender.com/b5blog/Bartender5-over-a-decade...
You can't tell me that was written by the same person.