Well, they're not wrong on that point, are they?

They did screw up big time, though, with this gem:

"You're right that the wrong-size tires can affect the odometer (and
the speedometer). But those are affected only when the diameter of the
tire is wrong, not the width. And since your tires are all the correct
diameter (they have the same inner opening, 14, which is the wheel
size, and aspect ratio, 75, which essentially is the height of the
sidewall), your gauges shouldn't be affected at all."

For a given aspect ratio, diameter is directly proportional to width.
75 is not the height of the sidewall, 75% of the width is.

They're very entertaining, but not particularly knowledgeable.