Didnt watch the whole interview. From what I gathered, Reichkoff central point's is that the movements like Defund the Police, M4A dont resonate with the electorate in non-democrat strongholds, and probably alienate moderates. That is valid point, as almost half the country voted for that baby currently in the white house, who happens to be on the complete end of spectrum. Its fairly evident that electorate isnt sophisticated enough to appreciate "leftist" policies.
What I disagree with, is his characterization of the dynamic between the progressive and centrist factions. He admits that virtually no democrats ran on Defund the Police, but he blames them for being associated with grassroots elements that pushed that slogan (guilty by association much).
Maybe cuz of he's a white dude, but it appears he doesn't appreciate how much of a balancing act it is, to cater to multiple coalitions (blue collar men, feminists, hispanic, black, environmentalist, LGBTQ) in the party, and the fear of an insurgency within the party (refer to ADOS and even justice democrats tbh). The republicans have the benefit in being one Trump coalition.
He puts the onus of turning the other cheek on progressives when centrist are the older and more mature people in the party.
He splits hairs between democratic socialist (AOC, Bernie) and regular democrat, and not to say its not a valid distinction but by and large, democrats and democratic socialists have the same positions on most of the key issues: environment, immigration, willingness to tackle police reform, workers rights.
He forgets the democrat brand is in shambles mostly due to Hilary Clinton, Nancy Pelosi et al., and being relatively feckless in governance
I think anyone can appreciate his pragmatic views on things, but he underestimates the cult of the Trump and republican media machine, that labels anyone with an iota of sympathy for immigrants, LGBT, or minorities as left wing socialists hell bent on destroying the fabric of America.