To follow up again:
I went back some time ago and they still failed to correctly pull a shot of espresso.
I also left a direct message for them, a private message that should have been a "retain a customer" slam-dunk, but they didn't get back to me.
They're just not interested in correcting training/mechanical issues nor responding to consumers who reach out. I deserve better, and in this town I can get it at any number of shops within a few-mile radius.