It looks to me like they used the resistance of the filter coils to measure the +12V currents.
Obviously that 15A rated input draw is impossible and the +5V output can't be capable of 24A if it and +3.3V can deliver no more than 100W between them.
And that upside-down SMD resistor is also a stunning QC fail.
I'd also prefer if they used single thick wires rather than bundles of thinner wires to the modular connector board, e.g. 1 × 12AWG instead of 4 × 18AWG, although that's perhaps nit-picking on my part. I can't say I feel totally comfortable with that naked EMI filter board in fairly close proximity to a few of the secondary-side wires, for that matter, and that threaded stud attached to the rear panel is clearly intended for the earth connection, so why didn't they attach the earth wire there (instead of holding it under the PCB screw and running the risk, however slight, that someone attempting to repair the unit will fail to put it back)? If it's any consolation, at least they used a larger MOV than in many other units.