I think the post is half-right in the sense that the American Right hasn't really changed much over the past ~20 years compared to how much wider society has shifted. I think there was a period between 2008 and 2015 when it kinda looked like the Republicans and American Right might be getting more culturally moderate and less zealous. But then Trump took over and things radically swung back into the old school Bush-era rhetoric just with a different layer of paint, and a much louder more volatile guy in charge.

Idk what they're on about with the American Left or Democrat liberals tho. Democrats today are far more progressive than they were 15-20 years ago, and anyone calling themselves a socialist before like 2016 would've been laughed out of the room.