That used to be the case, but they do officially distribute to limited areas. New York primarily has been receiving regular shipments of Heady Topper for several years now. During COVID they sent shipments to California and Denver, and have continued to do so on an occasional basis. Monks Cafe in Philly also has received shipments. All through proper distribution channels.
I occasionally get Heady Topper in New Jersey. The stores usually limit how many you can buy, but it does show up here and there.
There's a handful of bars throughout NY that you can see at least Heady Topper at. In the capital region, Albany Ale & Oyster and The Ruck will have it with regularity. Seeing Focal Banger is much rarer, and then all their other beers are essentially taproom in Stowe only though.