Different concepts, half-cell means your only testing half the cell, usually by means of an experimental setup where the opposite electrode is not limiting, either by just using a surplus of active material or using some standard electrode that doesn't correspond to your proposed chemistry. You can't really physically run a half cell, rather, it refers to a test setup where only one electrode is really being tested. Anode-less designs have a fully active anode once they are at non zero state of charge, they just don't have active material on the "anode" as built. Metal plating batteries are often built like this, were you just have a current collector of some other material, and the cell only goes to it's theoretical potential once you start depositing the anodic material on the current collector.

There are tons of chemistries/architectures in various states of commercialization, but this seem to be half-cell work which is about as far from commercialization as you can be.

Anode-less architectures have been around for a while, it basically just means that the anode is formed in-situ during charge, but the as built battery only has a current collector onto/into which the anodic active material will go, as opposed to having an active material anode already present in the uncharged state.