Forming an LLC isn’t really legal heavy lifting, but ya a lawyer should be the first person a lottery winner talks to, particularly before the lottery commission. They just want a PR spectacle and damn the consequences.
Reading through that article seemed to lay out a hard path but it would certainly be worth the effort. I would just hate to hang onto the ticket and not come forward right away while all the legal machinations were carried out. My inclination would be to cash it in asap fearing I would lose it or die or something