The website’s video and text is outdated in at least one way. That video still mentions QR codes, but we have phased out the QR code process on receipts and no informed CBP agent or airport contractor employee should be using or expecting QR codes for MPC use.
The video in the link above mentions “returning” VWP users. The video doesn’t indicate that first time VWP/ESTA users are eligible to use MPC. But this wouldn’t be the first time where a US airport of entry and/or the MPC app were more up-to-date and informative than CBP.gov website material.
A hint about MPC use: I wouldn’t count on airport wifi networks or even roaming mobile phone data to work inside a very crowded US airport of entry while seeking to be cleared into the US. So you may be better off filing the MPC declaration immediately on landing while still taxiing to the gate. ORD, for example, has had such internet connection problems this month for potential MPC users coming off the CPH-ORD flights.