We stayed on Stefan Dag's property in Carbondale back in 2019. Real interesting guy. He was talking about getting the inflatable poles into production then. Not sure what happened afterward.
They've been in production , previously marked as Airkipp gates. I met Stefan in Aspen in 2014 or 15 he was at the women's WC races and set up a couple inflatable gates as a demo next to the lift base.
I have no experience with them but I believe the feel and moves a racer makes in these gates would be different than in a plastic hinged gate course. I suppose the durability would be a big question , then again we destroy plenty of SPM shafts, so who knows, maybe it's a wash.
The ideal use might be high glacier training, as a full "bundle" of gates would fit into a backpack.
Then again, as Rudi says, you could just bring up a bag of stubbies......