The great performers of the past truly make you love them. From their hands exudes a love for music; it is impossible to be envious of them, one can only esteem them and take them as an example.
Enjoy this recording of Mozart's concerto K 488 for piano and orchestra, played by a Horowitz who had well passed the age of 80!
The cadenza should be by Busoni, if I am not mistaken.
I am convinced that a version was given (by those directly involved) that identified the cadenza as the reason for the "break," which likely had its roots in a musical distance that was difficult to bridge. In such cases, due to the rule of being "politically correct," one cannot tell the truth and must find a justification that satisfies the press and the questions of the public.