The entire report is long and filled with data that you really can't do anything with, the only number you need is from the line for battery pack capacity. If they give you more than that you will probably find it interesting (even if not useful) I'm just letting you know you aren't missing anything if they just give you the page with the battery pack capacity.
Correction, I just remembered that someone said there is a value for longest time that the HV battery went without charging. If true this would be very useful as we know that some Clarities spent 6 months to a year sitting on dealer lots, and if the dealer was careless about keeping it charged then the HV battery may have run down to lower than it should, which would not be good. Unfortunately the value itself wouldn't tell the whole story, let's say it reports that 4 months was the longest period without charging. Well if the HV battery was full at the beginning of that period it should be fine. But if it was at 0 EV miles (10%) for example then after four months it could have discharged below what would be safe for the battery. The lowest it will go in operational mode is 1% and that is rare. If it discharged below that it likely is not good for the battery. But again no way to know what the battery level was during the longest period without charging. But at least if it says it never went more than say a month without charging then either A. it was not on the lot very long or B. the dealer kept it charged. To be clear I don't know for a fact that this information is available in diagnostics, just that someone said it is. Supposedly it also will tell you the same thing about the 12V battery, although that's not as big a concern, worst case they neglected the 12V and shortened its life, but the Clarity uses a standard 12V battery so low cost DIY replacement is possible, and some people have even gotten the dealer to replace it under warranty.
We really don't know how the HV battery capacity value is calculated, my theory is that it updates the value whenever you have charged to 100% SOC followed by a full discharge to whatever the voltage is that corresponds to 0 EV miles (10% SOC), with no charging in between (other than regen which it can account for). It then would calculate the Ah capacity based on how many kWh were discharged. That's my guess anyway. You would think it takes temperature into consideration.
Since it's a royal hassle to obtain the capacity most people have only gotten it once (if at all) and so we don't know if the number changes every time you charge, or maybe it averages the last few charges, or maybe it only updates if say the last three charges have been lower than the previously stored value.