No, I do not have all the logs that prove it, but I used to farm AC a lot in Velious era, and he spawned all over the night. So no matter whether or not killing the placeholder makes any difference at night, there was definitely a way to "push" the spawn time to somewhere later at night, depending on what you did in the daytime.
Why does the wiki even link to a claim of Nilbog that "it works just like that" (regarding the revealed eqlive spawn mechanism:
https://www.project1999.com/forums/s...4&postcount=57) when that is clearly not true (anymore)?
As things are, the p1999 AC (on green, at least) is a "newly invented" spawn loosely based on the classic ancient cyclops.
If we're inventing new spawns on p1999, can we put Quillmane on a static spawn time as well? And the gods? And dragons? Maybe just sell dragon loot for $$ directly from the staff?