If anything, I think the food comparison shows how ridiculous it is. 2 by 4 is not a actual dimensional description really, it is a name. Food labels are one of the most misleading (intentionally most of the time) common labels we see, as manufacturers intentionally try to make things seem like they are something they are not. Low fat, whole wheat, less sugar, blah blah.
Bought a bottle of grapefruit juice on vacation last week. Brand name, large print all over saying real juice, not from concentrate, 100 juice, etc. Then in fine print on the back it says ], may contain OTHER fruit juices. So my grapefruit juice was REALLY white grape and Apple with a splash of grapefruit presumably because that is much cheaper fro them to produce. Though no savings was passed on to me. Presumably they got the ounces correct, but who really cares. I paid what I paid for whatever amount I got in that container and am not going to double check it. To suggest that food labeling like that is held to a high standard is BS.
I still fail to see how a person's ignorance about lumber dimensions translates into any type of intentional misinformation and something that has any real basis for a lawsuit. Who was harmed? Who was intentionally misleading their consumer? It is frivolous and ridiculous.
Perhaps it is time that some responsibility for educating ones self about a particular area be on the person, not the seller or manufacturer to put ridiculous warning labels on it. Caution the sharp edge of this knife will cut your skin. don't point the gun at yourself and pull the trigger. Don't put this plastic bag in your babies cradle as a toy.
Time to thin the herd.