You also seem to take as a given that DEI, virtue signalling, immigration will be as it was in 2020, but I doubt it. Parties are capable of growth. The Democratic mainstream seems like they're less extreme now.
The Democratic mainstream was never extreme - that has always been a right-wing propaganda point, but you are generally correct. They are, as a party, trying to distance themselves from "leftist" and "progressive" politics, disavow trans rights and "woke" and rebrand as the sensible center-right alternative to Trumpism.
And that's why they will - as they always do - somehow snatch defeat from the jaws of victory. We need an actual leftist party that actually defends the values they espouse, not a center-right party of neoliberal Quislings so desperate to impress the cool kids that they'll throw an election just to defend genocide.