I don't think the point of the article is that everything was intentional.
He leads with the differentiators from WordPress because WordPress alternatives are a big conversation at the moment. This is a chance to inform people about how Ghost chose to be different: Non-profit, no plugins, etc.
But the final section ("Governance & the road ahead") seems like a subtle admission that the current Ghost structure wouldn't prevent a BDFL from going off of the rails. Maybe it's too subtle, since he doesn't explicitly connect statements like these:
Neither myself nor Hannah own any shares, assets, domains, trademarks, or other companies related to Ghost. Everything is owned by the Foundation.
From the beginning, Ghost's governance structure has had a board of trustees made up of its two founders, myself and Hannah.
I think Matt showed that some of the open-source-foundation shell game isn't real: There's a WordPress Foundation, and WordPress.org, but it really all belongs to Matt.
So, if Ghost can follow through on changing it's governance structure, it gains another differentiator from WordPress.