Yes, Valve is still working on an anticheat for its new shooter, Deadlock.
A developer for Deadlock – the hero shooter Valve wouldn’t admit existed even after it had hit a concurrent player peak of over 16,000 last month – first confirmed on the game’s Discord server that it was working on anticheat back on 11th August.
Since then, the development team has dropped several updates saying it “certainly considers [cheating] a very high priority in the long term”, and had “a group of people working on anti cheat”.