I don't think they are waterproof unless you do it yourself. The following Q&A is in both the Cabals's 6x12 and Clam's Escape Ice manual's FAQ section and on their website's FAQ (emphasis/bold mine).
Clam owner manuals
https://clamoutdoors.com/pages/owners-manuals
And FAQ
https://clamoutdoors.com/pages/customer-support
Q: Is there anything can be put on outside of the tent to prevent water from coming through, when we are using it?
A: Customers have been known to spray or apply water repellent on the outside of the shelter that you would use for camping tents or boots. (Camp Dry would be an example of this type of product). These products will not damage your tent in anyway.
Q: Will my Fish House leak because I can see pin holes in the fabric?
A: Quite the opposite, as you heat your house and the snow and ice begin to melt, the vapors can better escape the shelter through an uncoated fabric. When it snows or rains, the water molecules are larger than the vapor molecules and cannot pass through the fabric and into the house.
Slight derailment here but then there's this: "the water molecules are larger than the vapor molecules"
What? I understand the effort to simplify but this is over simplification of a explanation into misinformation. The properties of water molecules, including their size, do not change when changing it's state from solid, liquid, and gas. Besides. If you can
see the hole it doesn't matter how big the molecule is.