Not sure how accurate that survey is. Previous surveys have showcased that 10 percent of the US people have BTC, which seems a bit farfetched. Could be possible, but 1/10 people owning BTC sounds almost impossible to me, especially the number of crypto companies that restrict US users from using them
I don't think it is impossible since as back as 2013-2014 Coinbase (a US-based company as far as I remember) had been running a massive ad campaign giving out free bitcoins (not literally bitcoins, more like 0.001 BTC but you get the point), so it is not completely impossible that a significant part of the American population registered with this wallet. There likely were other promotions of this kind as Coinbase is not the only pebble on the American beach (or coast)
Now all these people seemingly made it into statistics