So, the multinational company is probably better at lying than the average person is at discerning lies.

There’s an argument that the best approach is to totally ignore what the vendor says and listen to trusted experts instead. If you’re buying a car, say, you’re probably not listening to what car manufacturers say. Or, at least, you shouldn’t; you will be mislead. If you happen to be an expert on cars it might be no harm, but otherwise probably best ignore them.