Yep, that's been out there for some time now
Thing is, what is going to replace it as a symbol for all the other things Pluto came to represent? Regardless of any scientific classification of planet or not, a set of psychological principles, feelings, states, etc. can be handily attributed to the MYTHOLOGY of Pluto ... so I am going to keep it in my psychological tree - there it doesn't matter if it is a 'planet' of not.
As far as Kabbalah goes, I have no need to consider it as I use the old system in the Kabbalistic Tree of Life ; 3. Shabbathai (Saturn) , 2. Mazloth (Zodiac ) and 1. 1 Rashith ha-Gilgalim (Primum Mobile or Celestial Sphere). I equate the lower 7 sephiroth - in their planetary associations - as similar to the Hemetic Spheres ( a passing ‘through’ them or ‘down’ to earth for incarnation, and a ‘realisation’ or progression back up through them as an incarnation's progression) when one has an understanding of how the ‘planetary spheres’ relate to the ‘psyche’ then one can (at ‘sphere’ 2) incorporate the understanding of the ‘journey of the Sun’ through the 12 signs – much the same way as astrology sees the variant influences of planets and signs. Beyond is the whole celestial sphere and the knowledge of its function and dynamic with the psyche (in a geocentric … or perhaps egocentric analogy)
I cant get this with the outer planets in those positions. In my psychological tree they represent collective and transpersonal energies that relate to many different things than the other planets do, mostly in their process of forming an energy field ( in a sort of looped feedback) from the other dynamics and relate to time and location (of culture and society; mores taboo, regulation of the Id by the Superego , etc ) and not a ‘self-contained’ sphere (I know … bad analogy) like the other planets … hence my variant psychological tree. That is, one system , the ToL (with planets zodiac and heavens) seems to relate more to progressions through ( 'down to or up' ) spheres of formation and realisation and the psychological system (which includes the outer planets) seems to be 'interacting' and 'happening all at once' - (I realise both do that to an extent - hard to explain here without going off on to a tangent .... and I wouldn't want to disrupt Yogiman's topic
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IMO , outer planets on the Tree is a bit like seeing 22 majors and 22 letters … AHA! I will just fit them together this way … and … hmmmm … maybe THAT way and …. No …. <smashes round peg into square hole with a hammer> … there ya go … good enough ! But IMO it is not ‘good enough’ for a psychological map.
You can turn a fish pancake into a seafood dosa but it won’t make a good desert