This is correct. Tbh most of his commentary was similar to ettingermnentum where Platner is a symptom of the Dems being unable to run credible candidates so any person who is anti establishment, anti-zionist, left-coded destroys establishment candidates.
Most of the time he's also pointed to Abdul in Michigan as a far better example of a left candidate. And furthermore, before the accusations there was an argument that if the options are mills, Platner, and collins, well, that's pretty easy math. Obviously DSA/PSL dropped the ball not running someone, but I don't know how organized the orgs are in Maine.
Of course even AES isn't a DSA member like DAC, so obviously more work can be done, but I think Hasan, AOC, etc. Actually get the W here, they never endorsed and treated this shit with the skepticism it deserved.