Update 15/03/22 - It's now fixed, with no word again from anyone. The EAC file was just put back nearly ~9 hours later.
It's still not really clear what's going on. No announcement was made previously from any party. Valve didn't say anything, Respawn (the developer) didn't and EA (the publisher) also stayed silent. It just seemed to go through Deck Verified, and showed the whole world it worked as it was properly live on the Steam store and in your Steam Library on Deck. Now, a patch came in and it has removed the Linux Easy Anti-Cheat file so the game will boot you out telling you it's not working.
This is pretty frustrating. We've talked a couple of times now across articles and videos on issues with Deck Verified, and this certainly doesn't help. There's always going to be teething issues with a new platform of course but this isn't even a Top 100 title, Apex is constantly in the Top 10 on Steam. To have it break like this even though it's Deck Verified? What the heck is going on?
It does bring up other questions now too like: how long is the lag between a major game getting an upgrade, and it going through Deck Verified again to check it works? What about smaller games, do they have to wait longer? The list of questions goes on.
Such a shame, as it became an instant favourite of mine and worked so nicely on Deck: