As many commenters have already stated, this essay clearly mischaracterizes both talent and passion.
In truth, both can coexist together. In fact, both are pieces of the same puzzle. As mechanical_fish pointed out, passionate but untalented people exist. And guess what? Talented but dispassionate people exist as well.
There was an article here on HN recently, discussing common creativity blocks. The article mentioned a certain study which found that, once a certain IQ threshold was reached, creativity no longer scaled with IQ. They became independent of one another. The same is likely true for passion and talent, with the ultimate effect being on ability. Once you reach a certain threshold for both, an increase in one will increase your ability to ultimately perform a task. This accounts for situations like those of the author, where a low perceived talent had little effect on his ability, as his passion was so great. It also accounts for situations like those described by mechanical_fish, where a person has not reached a certain natural talent threshold, and can therefore not increase his ability substantially through passion alone.
Most people have one in spades, and enough of the other. Those that have tons of both -- well, that explains savants.