i have a tendency to believe these are actually "optimized" for the switch. Nintendo themselves aren't even USB C PD compliant on their console (which is pretty terrible) so those words mean nothing when it comes to the switch. other banks have bricked the system even if they were PD compliant. maybe anker and nintendo worked together on handling the power delivery on these banks the way nintendo does it on their nintendo made products (aka their charger)
just a guess
just a guess