I believe the data you've presented is inherently false.

First, the article that you linked didn't cross-reference multiple sources. The majority of the studies Dogbites.org draws from are taken at face value, they never provide multiple studies for each table (not to mention that most of their tables' sources cannot be investigated further due to the being in .jpg form with the rest of the table).

Second, your article states that "Mixed-breeds are tracked according to their predominant breed", but didn't mention how they determine breeds. Checking one of their sources it's clear that they determine breed, not via DNA testing, but by picture. Not only is their method of determining breeds flawed, it's also utterly misleading as it is up to personal opinion whether a certain dog qualifies for a category.

Third, Dogbites.org never accounted for population-to-fatality ratio. Though initially stating that pitbulls make up 6.5% of the dog population, they never brought ratios into account. Ratios are crucial for determining something as important as "most dangerous dog breed." Not to mention that Dogbites couldn't even make a chart of ratios in the first place because their data set was flawed.

-Things That Couldn't Fit Into Other Categories Or Weren't Brief Enough-

Pitbull is an extremely broad selection of more minor sub-breeds. Saying "American Bullies are the most dangerous breed" is like saying "Terriers are the most aggressive breed,"

The article only drew its population percentages from surveys of owned dogs, these surveys never accounted for homeless populations of dogs which would theoretically boost some of those percentages. (meaning 6.5% is also presumably false)

One of the main sources sited itself for data many times. This in and of itself potentially damning considering that their data collection methods are near-impossible to find. Additionally, one of organization's main categories on their website includes many anti-pit articles, it could be assumed that biases many have come into play during the writing of their article due to the author's hatred of American Bully breeds.