@metal-brain said
Trump is to the left of Biden. Democrats were duped into voting for a DINO republican.
https://www.truthdig.com/articles/joe-biden-might-as-well-be-a-republican/
This explains why some republicans have openly endorsed Biden. They have another republican to choose from.
The author of the piece you cited, written in May, obviously doesn't think Trump is more "left" of Biden:
"Like it or not, the imperative of defeating Trump is directly in front of us. To make a progressive future possible, beating Trump is absolutely necessary while very far from sufficient. To organize against a government headed by Trump is to push against a thick stone wall. To organize against a government headed by Biden holds out the real potential of progressive breakthroughs."
https://www.normansolomon.com/norman_solomon/2020/08/why-the-left-must-reject-and-elect-biden-at-the-same-time.html
And:
"But this presidential election isn’t really about Biden, who’s a garden-variety corporate Democrat. It’s about a clear and present threat to democratic capacities in the United States."
"“And crucially, Biden is moveable. We’ve already shown that with mass pressure, we can push him to support more progressive policies. Trump, on the other hand, is immune to public persuasion or protest. With a Biden presidency, a disciplined and mobilized left could extract significant victories. With another Trump presidency, the left would have few options and could face new levels of government repression. Our democracy, our planet, and our human rights would continue to sustain enormous -- and potentially irreparable -- damage.”
https://www.normansolomon.com/norman_solomon/2020/08/time-to-defeat-trump-without-make-believe-about-biden-by-norman-solomon-one-result-of-the-republican-convention-will-be.html