And it can't be coincidence that the exact same smoke-like effect is present when Enma's sucking Zoro's life, similiar to when BIG MOM did it to Luffy's boundman. Soul manip via Haki drain has consistency between Linlin's DF and Enma's effects. (Both visual and narrative)
It's also the fact that Luffy running out of boundman is always shown with him exhaling smoke out, but in here you see that smokey effect around Linlin, and there's loads of that same stuff getting dragged off his whole body rather than just his mouth.
So whether it's Life Force manip resistance or Soul manip resistance is.. Generally up for debate. I'd say Zoro lasts longer when Enma's doing it than when Boundman clashed with BM, mostly because Zoro's haki is currently stronger than the Luffy that clashed with her during the wedding. Stronger Haki>better resistance.