Not a plot hole. And if one, not significant.
It is a very SIGNIFICANT plot hole. It not only disregards or unexplains everything in regards of phase 1 right up to the Avengers, but it is the key PLOT to how and why Carol Danvers got her powers which that in itself isn't fully understood aside of just accepting it. There's nothing explaining it as to how, when or why they have it. It is a plot hole that changes the whole continuity of the MCU.