Yobobojojo said:
yes to everything. If someone is able to resist your existence erasure that doesn't change the fact you still have existence erasure it's just that this specific opponent can resist it.
Zeno doesn't gain resistance on existence erasure as he never essentially resisted it. He would most likely resist if Beerus tried to use it against him, but that is still just an assumption and not a feat.
In DB you resist almost any hax if you have more power, it's just that in order to resist some of them your power needs to be quite a lot greater. Like Jiren powering up to resist Hit's time lock or Goku using KK 10 to resist Hits time skip.