I guess it was mostly advisory, with the added purpose of making it seem like the various organisations were stewarded by members of the community that were not Matt Mullenweg.
You can't know what other conditions Mullenweg signed in contracts such as shareholders agreements etc.
Typically if you take VC money, the VCs will require the ability to sack the founder and take control, perhaps if particular targets are not met.
I've seen it: an ambitious owner agreed to stretch goals, and the VCs took took over the company from the founder after they had predictably failed to meet the goals.
The fact that they were subsequently fired doesn't make it into a performance. It's still a board resolution.
Delaware law requires a board.
Whether limited liability should actually be allowed at all in such a situation is a better question.