Check out
this video. It shows the actual power usage for an L3+ with 220v as well as 110v.
In the description of the APW3++ it says it only comes with 9 connectors, but in your video it clearly comes with 10. If it only came with 9, it wouldn't be able to power up two, so I guess it's a typo on their website?
It's a little confusing, but there are two versions of the APW3++. One of them has 5 pairs of connectors (10 total) and the other has 9 pairs of connectors (18 total). I believe you're looking at the one that has 9 pairs, which can run two L3+ from a single PSU when using 220v.