Hi Pablo,
I'm confused by these instructions. I entered from the south side of the block (the only entrance I could find to this garage and I drove around the entire block), went up one ramp to 3rd floor (we agree on this), and then found the superchargers in the southeast corner of that floor.
Posts #12 and #20 in this thread state the power output of these chargers is limited to 63 kW. Reason is likely that the electrical system at this mall or Parkade cannot reach an output of 72 kW. The limit of the Supercharging power is the limited to 63.
Although Tesla has told me that the 63 kW capacity listed on our navigation systems is correct, it would be a simple matter for someone with a low state of charge to see if their charging rate exceeds 63 kW to resolve this question.
It's true that your data point at around 35% supports what I was told by Tesla. However, it is just one data point and it would be useful if others with even lower states of charge reported their experiences as well.
Doesn't look to be a "Tesla hardware" issue. Based on the nameplate, It's the same as the normal 72 kW urban charger cabinets. Nor voltage drop since the cabinets aren't far away from the charging posts. So, I'm left with the same assumption as @eladts in post #20, that there's some electrical power limitation on their service. Looks like they're getting electricity through the mall's service (see the pics of the big disconnect switches by the cabinets), instead of a direct service from the utility. Likely 1/4 MW was the max available or allowed.
