Don't know why he's saying that, myself and many members here use skins with their cf tarps. Maybe pizza can chime in?
I use Kat's skins on my ZPacks cuben tarp and have had no problems.
This quote below is copied from the ZPacks FAQ page. The question refers to tents, but is still relevant.
Should I Fold and Roll the tent or just cram it into the stuff sack?
I normally fold and roll. It seems to trap less air and compress smaller compared to crumpling it up. It also keeps the tent from getting all wrinkly. Other than that, cramming should be fine too.
In reality there is nothing more damaging to the adventurous spirit within a man than a secure future.
Yep, I roll mine up and pull the skins down as I do then end over end it in the skins and put it in my cf bishop bag.
I'm not sure I buy the whole tarp venting deal in skins, most of the tarp is rolled up in itself and only a small surface area is exposed to the skins. Main reason I use skins is to keep them out of the way when deployed if I don't need them at the time, but there if the weather changes.
Just received my tarp sleeves in the mail today. They're perfect, and katharina was a pleasure to deal with.