maybe he wasn't used to all the fancy RED cameras and lots of lights (you can see he's blinking a lot in the video, maybe nervous reaction or just sensitivity to light). Still it doesn't hurt to be careful, though you don't need to be paranoid about it. So anyway, chances of getting zapped by charge in capacitors nowadays is fairly low, and most power supplies should be safe after around 10s or so after you remove the mains cable. So power supply turns on, the resistor or varistor limits current and capacitors charge quickly but at slower rate (instead of let's say 5 ms, they charge in 100ms) and 1-2 seconds later, a circuit in the power supply turns on a mechanical relay which shorts out that resistor or varistor, taking it out of the circuit so it's no longer heating up and cause efficiency losses. By installing a resistor or varistor, the current is limited and the primary capacitors charge at a slower rate. When primary capacitors are fully discharged and the power supply is turned on, the capacitors simply suck in a lot of energy at a high current rate, which can cause the fuses in your house panel to think there's a short circuit somewhere and trigger.
Modern power supplies also use mechanical relays to short circuit resistors or varistors which are installed before primary capacitors to reduce inrush current. When the psu is turned on, this chip detects this and disconnects the bleeding resistors so there's no losses. When psu is turned off the chip enables itself and creates the connection between the primary capacitors and those resistors and the capacitors discharge. So in modern power supply there's a special tiny chip which sits between the capacitors and the discharge resistors and monitors the mains voltage. Plain bleeding resistors can in some power supplies cause maybe something like 0.1% loss in efficiency because the capacitors are constantly discharged in the resistors. These days, modern switching power supplies no longer use plain bleeding resistors to discharge the primary capacitors, because they're trying to get the efficiency of the power supply as high as possible. You should also check if this thing really Fcc and ce compatible The shielding could stop EMI from the transformer except just protect people so IF they have such a resistor they should still have it.
You should use a volt-meter and check the caps plz, if they are still charged apple is more BS than they could ever be, first year in electronics engineering and they teach people about "bleeding" resistors, that should discharge caps within 10mins MAX when unplugged so plz check it out for me (but be extra careful).