Biden does represent the big bourgeoisie in general (they're mostly in agreement AFAIK), like every other president, which is why he was selected; I'm talking about a hypothetical situation where he for some reason stopped being a disgusting person and decided to go off script, in which case they'd deal with him like they did with JFK (who was far from pro-worker, just not quite as obedient as they wanted)
I don't think an Amerikan president could do much even with all that theoretical power; acting against the big bourgeoisie would just lead to being assassinated or neutralized in some other way
maybe there is some prejudice involved in the basement comment (I can't speak for Shrike in that regard), but there's a big difference between that and comparing someone to a Nazi
maybe they were just mispronouncing the fruit