That lack of humidity control is what builds up a secondary layer of insulating frost/ice inside a normal chest freezer. It results in that "cleaning flow" of water inside the chest fridge, which doesn't sound as sanitary or healthy as the author proclaims once it builds up to a significant level.

"The amount of condensation depends how much moisture is in the ambient air and how often and how vigorously we open and close the fridge lid."

Wait. I thought less to no ambient air mixed into a chest fridge cavity according the author.

There's this urban myth that opening the fridge door is a problem because it let's the cold air out. The author of this article falls for that one as well.

When you open the fridge door a small amount of cold air is replaced by a small amount of room air. Yet, even if it was open long enough for all of the cold air to be replaced (use a fan to push room air into it) it would have zero effect.

In a nicely filled fridge the mass of items cooled to the set temperature has, by means of it's heat capacity and the mechanism involved in heat transfer from solid to gas, a thermal inertia that results in negligible effects from occasional door openings.

For example, I'd be surprised if opening the door to a well-stocked fridge and leaving it open for five minutes caused a 1 gallon jug of milk to drop in temperature even as much as 0.1 degrees at the core.