I think he's wrong

( Citizen Cavy Admires your passion for conformity, Sun 3 Apr 2011, 19:31, 1 reply, 15 years ago)

I know it comes off as a bit disdainful of poetry
but I agree with the implication that poetry deals with ordinary experiences using extraordinary language.
(Zoz prayed for twink on, Sun 3 Apr 2011, 20:17, Reply)

I think he is saying that poetry
says things we all know in a way which obfuscates them. Really, poetry (at least in its best form) illuminates ordinary situations by crafting language to articulate the thing/feeling/something in a way which gets to its heart.
( Citizen Cavy Admires your passion for conformity, Sun 3 Apr 2011, 20:25, Reply)

I'd say poetry often does obfuscate commonplace things
at least insofar as it will deliberately approach them from an unexpected angle, which is not a bad thing. I think Dirac was just being flippant and, according to wikiquote, may have been having a cheeky pop at Oppenheimer.
(Zoz prayed for twink on, Sun 3 Apr 2011, 20:42, Reply)