I don't think he was "poo-poohing" it exactly. If everyone only follows evidence based medicine there will never be any improvement because there will never be any changes.

So someone has to be the person who ignores it, who tries new things. And that someone, in this field, is Warwick.

The evidence part comes in when that person also tracks their results! i.e. makes it a study, and Warsick certainly seems to do so.