I was sure i learned to pronounce it as "ah brawn" ij school
Quite possibly: that is the Munster pronunciation. The speaker uses the Connacht pronunciation.
Maybe this'll help to remember:
April is a brawn. XD
Got caught by Connaught accent again
And it appears that the Connacht pronunciation of "Aibreán" and "Aibreáin" are indistinguishable. You just have to know how to spell it in each case to make DL happy.