If you are referring to the last second (literally) FG attempt, that was a situation due to a goofy rule enforcement which made that kick next to impossible to make.
With the 10 second run off after the penalty, they has ONE SECOND to snap the ball, ON THE WHISTLE. Not to mention is was then a 59 yard kick. Had very little to do with Zuerlein. There is no way you can simulate that sort of situation in practice, so I give him a pass on that one.
On the earlier miss,, I'm not sure I would classify that as a "pressure kick". It was simply a miss. Something he only did TWICE last year. His FG % was 93% (26 of 28), so he is the least of my concerns with this team.