For the record, the Steam Deck makes up 0.82% of Steam gamers. That doesn't sound like a lot superficially, but it actually implies a decent number of Decks when you consider that Steam has somewhere between 100 and 150 million monthly users.
Of course, the Steam survey has never been a fully adjusted and controlled survey. It relies on Steam gamers opting in and hardware being correctly identified. For sure, the survey has suffered from some fairly obvious anomalies in the past, such as the RTX 3060 suddenly jumping up to 10% of users in AprilBut provided you understand its limitations and the context around the numbers, it's still a very useful guide to what hardware gamers use. And it does not make for good reading for AMD.