Because people hear the phrase "keepers shouldn't get beat at their near post" repeated over and over again by clueless pundits like alan smith which then just gets repeated any time a shot goes in at the post it's nearer to than the other post.
It's total bollocks cause people say it without realising what is actually meant by it. It's when the ball is very wide of the goal at a tight angle and close to the goalline that a keeper shouldn't get beaten at their near post because it means they've left a gap, that's basic goalkeeping 101 not to do that when the ball is out wide.
Mount was only just outside the line of the near post and it was a good hard and low shot into the corner whilst unmarked.
Pretty much unless the ball is dead centre of the goal the ball is always going to be nearer one post than the other, doesn't mean a keeper is it fault if the ball goes in at that post. The goal is 8 yards wide, no keeper in the world can cover both posts at the same time .