You can't trust advertising completely nor can you trust reviews completely but they are signals. Treating things as binary will not get you anywhere. Signals exist and are useful if not 100% accurate.
Edit: I do agree you should have a google-findable website which lists the objective characteristics of your product. If you call that advertising (I call it a "release", and I reserve the word "ad" for anything that has emotional appeal and caters to the indifferent/uninformed), then I agree.
You need someway to get whatever your selling into a place where people buy things