No need to apologise. I started to write Eos Web Installer Support improvements when I read of people launching into flashing their brand new phones as if it was dead easy and needs zero preparatory understanding.
Now you are oversaturated with information. I recommend to sleep on it. I find myself repeating myself but I do understand that the links I have given you are not dead easy reading.
Good that you have come to this conclusion regarding dates on your own.
However get_unlock_ability=0 tells us something other than the proper install instruction has happened (yes, of course, eosinstaller installer did something and you recovered the phone). No harm done … except
User experience tells us that if you install and lock in one flow then one will see get_unlock_ability=1 – what is the difference, does it matter? You would like “define”. [1]
I completely empathise with your predicament, but I would only aim to try to point you towards “minimum risk reading material”.
Is something different and of no concern today. 
[1] Locking has to ensure full device integrity. Say that integrity cannot be confirmed one might expect locking to fail with error. It is however complicated by lock being a two stage command.