To be fair thetitle doesnt make much considering anymore as I doubt they were working on this timeline in 1993. I agree it was probably the intention in 1993 but not obviously in 1998 it may be again now who knows.
No, the date of its release does not matter unless the intent was notably changed. The original intention was for it to be a prequel to the stories of LoZ and AoL, and its place on the timeline so far has never been mentioned again, other than that Miyamoto quote. But as I said, that quote doesn't make sense by a lot of means. The intent of ALttP in the first place was to give some history to Hyrule and Ganon. That is why the BS of ALttP, as well as the manual, gives a lot of information as to who Ganon was and how he came to be.
As for the box if the pred. thing was so important then why was it removed from the info in the remake (which is the canon version)
It was important
for its time. As I said, the only other Zelda games out at that time were the first two. The box art referenced predecessors of
those two game's characters. It wouldn't make sense to leave that on the back of the box now considering there's been so many other Zelda games made. People would start thinking that ALttP took place before any Zelda title, or even be confused by which Zelda and Link it was referring to. It only makes sense that it was removed.