Almost certainly, yes.
People on Mastodon are not happy about those statements, and called Proton out on it relentlessly with every post Proton made. This is Proton running away with their tail between their legs, back to platforms where they have more control and/or are already full of right-wing nutjobs.
If anyone's looking for secure email, look at tuta.com instead. The email service is very similar in terms of UX and offers better encryption. They don't offer the rest of Proton's suite, but...maybe that's a good thing? I mean, do you want to get locked into an ecosystem?
"One mistake" would be if he didn't double-down on it, and if Proton addressed their customers' concerns in any meaningful way. Instead, they deleted posts and are now withdrawing from the community entirely, and directing users to three of the worst corporate hell-holes on the internet.