When we stopped support for Linux, we saw more cheat users exploiting Linux, than actual legitimate users. — reddit
That's curious phrasing. Did he expect legitimate users to stick around after support was taken away? Or does he mean that there were more cheaters than legit users before support was dropped?
That's not to say that cheating was super widespread on Linux, — blog
Okay, so his blog post suggests that it was the former, making his original argument really bizarre.
When we stopped supporting Linux, users made up less than .01% of the total player base, even if that number has doubled, or tripled, it's not worth it. — reddit
When we discontinued linux support in 2019, — blog
The Steam Deck was released three years later, and nearly four more years have passed since its release. The portion of gamers using Linux has grown considerably more than he imagines above, and continues to grow.
Enabling proton support would mean we're asking the EAC team to provide support for a whole other platform, which we fear would reduce their ability to support Windows — blog
That is a false dichotomy. Rather than assuming what the Easy Anti-Cheat folks would do if more support were needed for Linux, he should probably ask. I would expect them to respond to increased demand by hiring qualified staff, not diverting existing staff to tasks for which they are unqualified. This is how businesses grow.
For now, we're still weighing up the risks and will continue to explore options with EAC. Don't expect to see Proton support in the near future, but we hope to have it enabled someday. — blog
I think that's the most sensible thing he has written on the topic.