It is in fact great advice. here is why
3 Pressures all but guaranteed to be wrong
The pressure on the tire
The pressure the store put in
The pressure on the sticker
One pressure is right and that pressure is based on the weight the wheel is carrying.. So get it weighed.
Too much pressure and the tire does not fully engage the road. This can lead to loss of control and early tire wearout.
Too little and the sidewalls flex too much, also leads to loss of control and tire blowout.
Finally if the rig is overloaded he may need to either UPGRADE wheels or lose weight.. In my case I was able to upgrade tires.