I think the main issue of Wim Hof vs. regulars like us is whether you're able to maintain near skin blood pipes open in the cold water. These pipes shutting down immediately upon cold contact isn't really a good thing, it hits heart, near skin muscles get not enough blood, etc. On the other side, if your blood pipes keep pumping the blood while you're getting into cold water that is very healthy, that is the effect you're really after - the body starts to pump even more actively through these pipes to maintain the temperature in the near skin tissues and that pumping is really good for those tissues and for the heart and for the whole body. The hot shower/sauna is what makes my and other regular people's near skin blood vessels to not collapse upon entering the cold shower/pool immediately after.
