Somebody clearly never learned about significant figures. This happens all the time even among people who really should know better, giving false precision to imprecise measurements.
It's probably an educational issue as well. In the place where I came from, the people who ended up writing promotional copy were mostly humanities students in high school and university, but significant figures is considered an "intermediate" science topic not taught to humanities students.
In the US, significant figures are included in standard high school science courses. That doesn't mean they aren't forgotten though.
In France, in science we had to answer with the same number of digit after the decimal point as given in the exercise. It didn't feel right to me when that was crunched through logs and sine, but I got nowhere when I brought it up to the teacher. And even now the whole premise is flawed to me, because it's about significant digits, not just the number of figures after the decimal point, if you compute a times ten you have to remove one digit after the decimal point.