He is in the third-party repair business, so it makes sense for him to promote right to repair to protect his industry.
That, and as he often says, in an ideal capitalist world for both producer and consumer, the best way to retain business is to keep the customer happy, and an easy way to do that is to produce a quality product and not screw the consumer over, lest the product break or total itself and the customer go elsewhere for repair or replacement of the broken product. Satisfied customers in the first initial sale can lead to those customers returning often and recommending the business and product to others, leading to much more business (and profit) overall.
Was gonna ask if this stat included the Steam Deck, as that's also accounting for the vast majority of Linux gaming numbers. Whether it does include the Deck or not, it's a nice rise, but all the better if it doesn't include the Deck. I wonder if the popularity of using Linux on the Raspberry Pi is helping too.