For what it's worth, as of I20, they're not available in mission architect either.
I had one as an optional ally in my arc Faerie Gold (#95553), and it was working properly a day or two before I20 went live. I tested the arc once I20 hit, and it was replaced with a mech man, and was no longer on the list of available standard critters. I had to rebuild one as a custom character (fortunately, not too difficult).