You'll be submitting both evidence of your bona fide relationship AND evidence of consummation. However, the primary evidence for both is passport stamps showing the US Citizen is in country with you, on or after the date of the marriage.
What you've seen and what IS, are not the same. Your primary evidence that it works is in the I-130 instructions itself, and in the basic understanding that legal and lawful marriage, simply IS legal and lawful marriage. (In the USA, marriage is in the jurisdiction of each individual State.) Whether the Utah County marriage "works" for US Immigration, is not even debatable. It works.