I think everything he says there is legit. Brady's accuracy on deep balls has always been the worst part of his game (besides running, which, really, nobody cares about). I have no doubt that Peyton Manning hits Gronkowski for the TD on that INT in the 4th quarter.
But lost in the article (or forgotten, anyway) is the fact that Brady is the only QB in history besides John Elway to have played in 5 super bowls. It's DAMNED hard to get there and even harder to win it all. Every great QB - including Montana - had some rough patches in the playoffs. Not one escaped that dubious distinction. Why? Because in the playoffs, you're playing the best teams in the league. It's easier to rack up stats - whether you're Tom Brady or Ryan Fitzpatrick - against bad teams. Much harder to do against great teams. You will find very few QB with better career playoff QB ratings than regular season QB ratings.
So in terms of Brady's 3-2 SB record....what's better: going 3-2 in the Super Bowl or going, say, 2-0? Well, 2-0 is a better winning percentage, but 3-2 means that you have gotten your team there 3 more times than the 2-0 player. Somehow it's better to lose earlier in the playoffs (or to not make the playoffs at all) than it is to lose in the Super Bowl? That's crazy. Think of it like golf...
Montana: 4 tournament wins, 0 2nd place finishes, a bunch of top 10's, a few missed cuts
Brady: 3 tournament wins, 2 2nd place finishes, a bunch of top 10's, and just 1 missed cut
Peyton: 1 tournament win, 1 2nd place finish, a bunch of top 10's, and a couple of missed cuts
Elway: 2 tournament wins, 3 2nd place finishes, a bunch of top 10's, and a few missed cuts
Favre: 1 tournament win, 1 2nd place finish, a bunch of top 10's, and quite a few missed cuts
I mean, when viewed like that, Brady's resume - especially when you include the number of records he holds - stacks up favorably against anybody.