Green Valid point; licensing can be a bit complicated sometimes, though I’ll do a bit of digging around for specific things about adding a license in a bit, but yeah, the TLDR would be that for one to know if he’s required to follow that license is dependent on a few factors which personally don’t have enough experience with specific licensing terms to answer that
But regardless, if it were me I would just follow the updated/new license whether legally required or not because using someone’s work and then just blocking them is kind of just a dick move IMO.