This is most likely true.
Or perhaps arguable? I offer this as my pot-of-gold choice:
which has as a bonus factor a cadenza reworked from the one Beethoven fashioned for the piano version of this concerto. With timpani.
There's also a Schneiderhan recording with Celibidache in Italy which I didn't even know existed until I went looking for the ASIN for the above. I think I'll invest; I'm in one of those "let's buy something" moods. Cheapie Italian label, might be sonic crap, but what the hell, it's tax day....