Just wait until an enterprising DA decides to charge everyone in the coinjoin as a criminal conspiracy.

Helix shut down years ago. The tech that enables wasabi is pretty recent (segwit, etc).

IS this not a mixer?

The key thing that enabled the action in OP was the custodial nature of the mixer. CoinJoin (which Wasabi implements) is non-custodial. There is no central party who could be targeted as in the action in OP.

I suppose it is a mixer, but with more modernized protocols.

In earlier days AFAIK, a central coordinator was required to take custody of coins.

Now its mostly trustless.