Depends entirely on their contract and what is expected of them. Coding is just one possible duty of a lead in this sort of project - the article itself talks about him undertaking various fundraising duties - thats in addition to whatever time period (eg. retrospective) the money is supposed to cover.

Having said that, the salary looks excessive and the commit history isn't a good look without clarification.

But assumptions aren't always the best guide to what is actually going on.