Because Luxology and Foundry are pretty much one company now. Also it's a script made by Jacobo Barreiro (http://www.jacobobarreiro.com/jweb/). Unfortunately I don't use Mari so I won't be using this sorcery :<... at least for now.
Yeah, this isn't The Foundry's doing - their first steps appear to be more along the lines of making a Modo-Nuke link (although I imagine more will appear as time goes on). It's pretty cool, I should really check out Mari at some point...