I think there was some cross-pollination for a couple years beyond that. Sounds like they sold Humble off to be its own thing, but the Wolfire guys were still running it until 2019 (see Wikipedia quote below). Either way, they’ve got out of Humble well before they filed this suit.

Rosen and Graham, the founders of Humble Bundle [and the CEO and COO, respectively, of Wolfire Games], announced in March 2019 that they have stepped down as CEO and COO of the company, respectively, with Alan Patmore taking over the company operations.