Astrologers unaffected by Pluto’s demotion

My brother is an astrologer (yes, my brother is an astrologer) so I asked him if the demotion of Pluto from planet to dwarf planet has any impact on the horoscopes he writes. Here’s his response (my quickie translation):

Not at all. Our kind has been creating horoscopes since before 1930 with the assumption that there is a celestial body beyond Neptune and it doesn’t matter what it is called.

(Yeah, I’m way behind on this one but it took my brother a darn long time to reply, so bite me)