It does seem like the HV and LV are seperated into the daughterboards, which would give them some seperation. The actual seperation you need isn't that big and

It does seem like the HV and LV are seperated into the daughterboards, which would give them some seperation. The actual seperation you need isn't that big and if you're careful you don't need to divide the PCB into two strict sections (just look at most Multimeter PCBs). I also suspect that like 99% of power supplies, this is a transformer with a switching voltage regulator behind it since PD 2.0 requires a range of voltages to be available.