Twitter's announcement says they have been working on the Edit Button since last year. It has nothing to do with Elon's poll. Let's give credit where it's due.
Twitter? Adding an edit button is not exactly rocket science. Meanwhile at SpaceX...
edit: I liked your subtle edit below from "paid board seat" to "(ridiculously expensive) board seat". Strange to make it a negative to invest in a company you want to change, like other board members are allowed to invest for their board seats, but Elon isn't. If Twitter does good it will be lucrative, not expensive!