Just now in an arena game I had my opponent attack 14 times with Mosh'Ogg Announcer missing every trigger. 

https://hsreplay.net/replay/tY7rS87zVmynGinrZgtsUW

It was a long game, so if you want to see what I'm talking about, skip to turn 21, the game ends after the 14th attack. 

Odds are 1:16384 that this outcome occurs.

Just curious if I'm just that "lucky" or if the most recent patch did something naughty.

I think you misread that minion, Mosh'ogg says "Enemies attacking this have a 50% chance to attack something else.". In your replay opponent attacked the mosh'ogg like 2 times not 14. 

Mosh'Ogg Announcer =/= Mogor the Ogre

I'm an idiot. Thanks