It's a common way to write an auto-biographical article.

I found myself talking about "myself" in third person when the discussion gets philosophical with respect to free-will, as it can help convey my beliefs better.

PartiallyTyped stops being the person directly opposite the other party, but instead becomes a commentator, one who explaining the thought processes of the person that sits opposite the other part; it just happens that the voice of the commentator is the same as that of the person, and the lips are synced, however, for all intents and purposes of that discussion, that person is a p-zombie, and the commentator somehow manifests into the head of the other party.

The commentator considers the case where the audience may be wondering why one would create such a scenario. PartiallyTyped uses that scenario to expresses her belief that free-will is an illusion. She believes that talking about her brain but referring to the p-zombie person enables the other party to understand her point of view; that is, that she is the person that arises or manifests out of the zombie, the person who experiences the world even though she is never in control.

so that it can be quoted, re-shared, copied, etc. without losing context.

Yes, but also it could be written and maintained by an assistant, publicist, etc. as it's often the case with authors.

Why bother with the overhead?

He's obviously older, pre-Internet age. He may not be computer-savvy and care to maintain a website.

Time has value. If it's not how you want to spent your time it may be well worth it.

This is very common with writers. You (usually) don't know who produces content for the website (it can be the author himself or a third party). Plus it makes copy/pasting of the bio way easier, and you don't want, for instance, your author bio at the end of your books or on Amazon to be written in first person (it sounds very amateurish).

"seems weird to this commentator..."

I see what you did there!

why not?

also, what is weird anywho?