We have an expert here. Too bad you just spreading stuff you have no clue about.
Today we learn what "Common Sense" is and also what an "Educated Guess" is
1.) There is called Spoofing for CFW. This allows lower CFW to connect to PSN
2,) New CFW can be made minutes after a firmware update comes (typically they come a bit later, because devs test things out before releasing)
Now an educated guess would suggest that firmware updates do not do anything like you said.
Oh here is some more common sense, Since 4.82 Hacks emerged, The PS3 has been wide OPEN for about 2 years. and about a year where every single model has been open. So a firmware update that does nothing and cant even last 5 minutes for protection is what sony is doing to get mod menus off lol...
Kids please let the grown ups make theories because well we actually base the stuff around facts