fwiw I have been using Ambitious Pilot’s pushback add on without any issues with any of the 3rd party aircraft I have, including FBW A32NX, PMDG 737 Series and Fenix A320.
I do use the toolbar menu in flight to enable the add on before using it and then once pushback is complete I disable the add on again. I don’t know if this mitigates the reported “memory leak” or other issues with this add on… but it has not caused me any issues.