I’m not very familiar with Moulton either.
I just know one of my daughter’s friends is basically a socialist from Boston (though, she claims she isn’t!) and just overhearing a conversation with her recently?
The DSA types do NOT like Moulton, so seems like a no-brainer to me ;-)
Perhaps he's an old-school liberal rather than a "progressive" - not great, but not nearly as malignant either.