Elliott has always been very clear the absolute only thing they care about is making more money, and finding companies that they believe have a management team that is not 100% laser focused on increasing shareholder value have always been a target for them. Given Dorsey's dual CEO roles and his persona as the tech-male version of Gwyneth Paltrow's lifestyle brand, not out of character at all that they'd be eyeing a change in management.
As an aside, would someone who is more versed in the world of finance explain how these PE companies are able to have so much leverage when the stakes they take are still relatively small (e.g. single digits). Management in firms across the world shudder with fear when Elliott takes a sizable stake, but I don't understand how Elliott can wield so much power without having a greater percentage of shares.