Kurz got booted because of run of the mill power politics and because his clique was arrogant, careless, not very effective and made more than enough enemies. No outside influence needed.
But its funny, russian propagandist standpoint is that he got ousted because he stood up to the EU:
https://www.youtube.com/watch?v=oAhtC20nqjk
Kurz fell because Kurz was dumb and corrupt from the very beginning, and his party simply incompetent, and we are all glad to have seen him in the rear view mirror.
In fact, American agitprop'ers may not know this, but crediting Russia with Kurz' dismissal only makes us more willing to make deals with the Russkies.