Neither of these pertains to a trunk at all.
All the codes listed were to do with stationary rooms or fully sealed areas.
The trunk of a car is NOT sealed. If it was then you would suffocate if stuck inside.
It’s been a standard code since the late 90's, maybe earlier, that you can get out of the trunk of any car from within and that it is able to exchange enough air to not suffocate.
HENCE it’s not an area that would be considered not ventilated. Besides hydrogen is MUCH lighter than air and would escape though the speaker deck or rear seat much faster than is needed.
People have been putting AGM's in trunks for decades and have never had to add ventilation or any nonsense like this. HECK, in some cars, they have an AGM battery UNDER the front seat.
FFS making this into a big deal over such a stupid thread anyways.
WHO THE HECK cares if someone puts an AGM battery in the back of a CAR to run a MICROWAVE.
Reminds me of this every time i see this thread.