Where? Are you saying you can't score goals in the blue paint? Because in that case, half of Gallagher's goals should be overturned.
Rule 69.1
It also says "goals scored while attacking players are standing in the crease may, in appropriate circumstances be allowed" rendering your point about Gallagher inaccurate
In this case tonight it was not appropriate circumstances
Under 69.3
"If an attacking player establishes a significant position within the
goal crease, so as to obstruct the goalkeeper’s vision and impair his
ability to defend his goal, and a goal is scored, the goal will be
disallowed.
For this purpose, a player “establishes a significant position within
the crease” when, in the Referee’s judgment, his body, or a
substantial portion thereof, is within the goal crease for more than an
instantaneous period of time."
This is what I believe applied tonight