BenoitRen wrote:The Japanese version of Phantasy Star II says the same thing as the English one in this case, so it's not a translation inconsistency.
Actually, they don't. In the intro, while the English version says "Over 1000 years", the Japanese version says "Approximately¹ 1000 years"... which works with the Japanese version of PSI since the gap between JPSI and JPSII is actually
less than 1000 years.
PSEotM is the only game in the English series that gives us any sort of timeline.
1: The Japanese intro says 「およそ」 which translates to "Approximately" or "about"