Understanding that we are talking about a hypothetical but … with the approach of using an adapter, a USB-C charger and a USB-C to USB-C cable would work just fine with this hypothetical phone. (I mean “would work” if it works at all because obviously USB-C doesn’t always “just work”.)
So to clarify my previous post:
a phone might still be compliant providing that it
a) does not come with a charger, and
b) does not come with a charging cable, and
c) does come with a tiny adapter that has USB-C PD on one side and a barrel connector on the other side (and it doesn’t even matter whether it comes with this adapter as long as the customer can obtain the adapter).
By way of illustration that such adapters are not themselves hypothetical: UPERFECT X Mini lapdock works with Librem 5 (first bullet point) If it’s good enough for Kyle, it’s good enough for me. 