I mean, statistically speaking the author has a better chance of being right than wrong. 32 teams and only 1 can win it all. I could write the same article about a good number of teams and have a lot to brag about at the end of the year.
But the Bills should be exactly where they should be at the end of the year. One of a handful of teams that have a shot to win it all come winter. As long as they are healthy, it's the Bills, Chiefs and Ravens in the AFC. Whichever team has to only play one of the other 2 has the best shot IMO.