They didn't begin development on TWW (in its cel shaded form) until around late 2000, 2001.
I had this debate a few months ago. Basically, a timeline of
OoT
\MM-ALttP/OoS/OoA/LA-LoZ/AoL
does not work because it assumes no action is taken against Ganondorf. I would argue that until FSA was developed, ALttP didn't fit on the child timeline at all. And even then, it causes confusion, because TP was meant to connect to FSA and TP was originally on the adult timeline. MEaning FSA would have originally been on the adult timeline too.
You can only place ALttP on the child timeline if somehow TP moved FSA's place in the timeline when it moved (unlikely because all references to FSA were removed from TP). Unless you intend to separate FSA and ALttP.