By “eroding” they mean something that has resembled the Grand Canyon since Clinton.
Bush II mouthed kind words but filled his cabinet (I think by ignorance rather than malice on his part) with active antisemites like Condoleeza Rice.
Obama, of course, was actively hostile and make no secret he wanted all Jews dead.
Trump was fantastic and a true friend, but completely surrounded by deep staters that were either hostile to Israel or just wanted Trump to fail because they are nasty people. He did far more to hell the area than any President since (ironically) Lyndon Johnson (who, for all his faults, was very good to Israel). And Trump did it, dragging the kicking and screaming state department along.
Biden is Obama II with the extra layer of being a corrupt idiot completely compromised by numerous foreign intel agencies.
I don’t know why any nation would trust the US today.