It can be both true that there is no true Left with any political power in the US - individual congressional delegates, maybe, but no coalition or party - and still recognize that there remain differences in the parties and differing outcomes from their governance.
It’s not anything like the Southpark situation; leftists forget so easily what could - and has - been lost under conservative leadership, that would not have been lost if the person who won the popular vote in the past 6 elections. Women would still have protected body autonomy in all states - that loss was a direct consequence of the Trump administration.