No, that's not how it works with WSL2 as the backend. You then cannot configure a smaller amount of RAM in the docker app, it's greyed out. One can limit the RAM that WSL has, but that's not really helpful when docker steals all of it. (And WSL2 supports dynamic allocation of memory anyways, so it's supposed to return unused memory to the host)

So you are wrong. For those of us affected by the bug, it's a big issue.