Are you new? It's been a thing for years at this point.
Valve doesn't care. People are making a career out of cheating in their games by boosting people, raffling prizes on 3rd party platforms and selling boosted accounts.
It might seem like they don't care. But there's a difference in not caring and not being able to implement a proper solution. If people stay away from your game because there are cheaters, then you have an issue.
I do think you have a point, that it should be (way) higher on their agenda. But remember this is still in "closed" alpha test. They gather information, tweak/balance and are still developing it.
For TeamFortress 2 it took a couple of years before there was an update fixing the rampant bot problem. It wasn't high enough on their priority list. But cheaters are still abundant. I'm reliant on an external tool to quickly analyse the profiles of the players on the server to figure out if a player is legit or suspicious or a known cheater. It makes me doubt so many players, instead of just accepting that it was perhaps a brilliant shot/kill.
VAC blocks some standard cheats, but most games have atleast one cheater or a group of cheaters. So there's still a lot of work to do.
It's also too easy to make a new/alt account.
We're seeing this here in deadlock as well, where there are plenty of smurfs that prefer to play easier games. Cheaters make an alt-account to "test" cheats.
I read that Valve was working on better tools of identifying cheaters, using AI tools and were mainly training their model... but that's been years now and CS:GO apparantly still has a lot of cheaters.
In the (higher) competitive scenes, these cheaters are identified faster. But for the casual games this doesn't work. It's good to have matchID's and "proof" to be able to ban players based on that proof and the reporting you can do at the end of a match. But that's too late and the match was already ruined. Still better late then never...