This article sounds like someone's version of a poorly thought out 'good idea'.
Their version: "By leaving your boots on, there is no way for the water to escape, and it slowly makes your feet cold, or even frozen and frostbitten... Mors is actually wearing 3 pairs of wool socks, and the outer socks will start to freeze and form a "boot", while the inner pairs will keep you comfortable."
Okay, I'm reversing the above two sentences:
"Mors is actually wearing 3 pairs of wool socks, and the outer socks will start to freeze and form a "boot ... By leaving your boots on, there is no way for the water to escape, and it slowly makes your feet cold, or even frozen and frostbitten."
This sounds like a new version of the old harmful fairy tale of scrubbing frostbitten feet with more cold, wet snow.
I'll pass.
Sue