The paper describes 30x breaths with the inhale twice as long as the exhale, and a 15 second hold on the final exhale.
Wim Hof's method has 30x equal-length inhales and exhales, and a one-minute hold on the final exhale [0].
Aside from there being a substantial difference between equal length inhales and exhales and an inhale that's twice as long as the exhale, the big idea behind Wim Hof's method is that that minute-long hold is very difficult, and trying to do it supposedly builds a certain kind of mental (really, holistic) discipline that a 15 second hold simply would not. 15 seconds is not hard unless you're pretty out of shape.
