Nicolaou, I was merely offering what most JW's would say in retort to your "allegation".
They absolutely did not die on that literal day...I just see that JW interpretation would provide for several "options" to explain the meaning of "day". It is the same for Adam and Eve being perfect...I could anticipate their response being, "why would God create an imperfect image of himself?". In the JW mind, that perfection was theirs to lose, thus bolstering the "works" requirement of being rewarded eternity.