Can't agree with you more.
The fact that Brady is on this list is a joke. It's like putting Frank Lampard on it.
The position of NFL quarterback is typically an intangibles position.
Reflexes, timing, vision, decision making. The average time a QB has to make a read down field and make a decision, is about 2.5-3 seconds. Now, on top of all that, they need the requisite athletic talent to actual perform. So yes, while Brady isn't powerfully athletic by NFL standards, the guy has exceptional athletic tools you cannot measure.
Let's split the difference. In 2.75s, a QB has to read the defense. That means that they have to look at a defense, see how it moves, and decide what defensive package is being used. This makes an incredible difference in how and where he will throw the ball. Next, he has to anticipate the rush. Where the pocket is likely to coalesce. Is the pressure right? Left? Central? Are the ends coming hard? Are they dropping into shallow coverage in the flats? What is the secondary doing? Is it cover 2? Man? Man free? Nickle? What are Mack, Sam and Will doing? Now they have to read their receivers own interpretation, because the the receiver also has to identify the coverage, and adjust their route to the defense. If it's zonal coverage, the receiver has to shut any sort of crossing route down in a hole, or, they need to belly it out, or turn it up field into a seam. This creates variations in what can happen in a simple crossing pattern. The QB needs to then anticipate what will happen, seconds before it happens, and this is all sorts of insane math that your brain is doing that you're not even aware of, this is called "vision" as an intangible. The ability to anticipate the play, before it develops, so that you are 2-3 steps ahead of everyone else.
Then, they have to whip a ball 5-60 yards down field, with a very slim margin of error for how inaccurate they can be. They also have to make correct decisions about, who to throw to, whether or not to throw, whether to throw the ball away, whether to tuck the ball, take a hit and not give up a potential turnover.
Brady isn't the best arm. The most accurate arm. He isn't the fastest guy. Strongest guy. However, in the last 40 years, and let's be honest, probably in the history of the game, there has never been a guy who does all of the intangibles better than Brady. He makes the right decisions, the right passes, minimizes his mistakes, constantly, at level no other guy has ever achieved. This coming from a Packer fan, who has Favre and Rodgers to cheer on, and while Rodgers and Favre were both better "athletes", neither guy approaches the decision making of Brady and therefore they are not as good football players.
When you look at successful NFL quarterbacks, how you can compare any motorsport to that is beyond me. First, is the level of competition. Being an NFL quarterback, is one of the most competitive positions in the world of sports, in one of the highest paying sports on earth, in one of the highest paying positions in sports on earth. You're comparing one of the deepest, most competitive pools in all of sports, with a niche sport.
Now, I don't doubt the reflexes and decision making of a motorsports athlete, but the talent pool filtering into those sports is not large. Moreover, there isn't a marriage of athleticism between the intangibles, and the physically measurable like there is as a QB.