I wouldn't be surprised if you're right about the AI bit, but I feel compelled to nitpick your assertions.
Ram is a series of models (1500, 2500, etc) and includes vans. It's not one specific pickup model, and not even exclusively pickups.
I am too lazy to refer directly to the data the article is summarizing but "Ram" in the article context probably covers more than just the 1500 which is what most people probably associate with "Dodge Ram."
To your point though, referring to all F-series models as Fs would be odd, but I can't tell if that's just because it's a single character. I think a s/Rams/Ram Series Models/ would probably have made more sense.
Lastly, comparing a pickup to a sedan is sort of silly, don't you think? Trucks are much more difficult to control at higher rates of speed and acceleration, due to a number of factors and so being the fastest truck of the bunch is probably significant.
A gearhead I am not, but a cursory search of pickups reveals Rams are indeed marginally faster/more powerful than their counterparts from other brands.