I haven't followed the link, but 'egg' and 'preserve forever' in the same sentence doesn't ring true to me.
Things, edible, that preserve forever that I know are
-salt
-sugar
-honey
-olive oil
-some alcocholic drinks

Olive oil bottles may give a experation date (2 years after production) but in true, if well stored(dark, fresh place) It will last years and years. It loses a bit of flavor and taste with time, but it's good to eat and to cook with for 10 years or more. That only applies to real olive oil, I wouldn't trust industrial mixed vegetables processed oils.

Kind regards,
Tired21