Are you claiming that if you can ever read 13.2 volts from a battery it must
be
fully charged?
Yes or no answer please.

Must be?
No. You could get a false reading.

But you can get a 13.2 reading from a fully charged battery without it being a
false or artificial reading. That's the combined voltage of all six cells
before the battery self discharges to a lower voltage.

After a battery partially discharges, it will stabilize around 12.6. Partially
discharged is not the same as fully charged- although it will represent a
common state of charge for batteries that have been removed from
a float charer and allowed to self-discharge to that level.

Why do you suppose every battery charger mfg sets float voltage at 13.2 or
13.3?
Just an arbitrary number?

I'm amused to see that the laws of physics are suddenly suspended when they
don't support your tottering argument. :-)