I wonder if that would let you win with something like mass dark templar with phoenix's to snipe observers. You could run right past it, and it could never anticipate you.
Or better yet, imagine zerg where you can burrow every unit.
It would be the same as with a player: as soon as you do something with those invisible units, or imply that you have it (eg dt shrine), its sufficient to say that invisibility is in play, and appropriate tools should be used. Its not like you can do anything about dark templars even if you see the shimmer, if you have no sight, beyond body blocking.
Regardless, the article describes cheesing as the common tactic in early iterations, with economic-play being learned later — one of the described cheeses is dt rushes, which the AI apparently learned to deal with, so it should have some understanding of invisible units (alternatively it learned to ignore the dts and base trade or something).
I don’t think the shimmer is useful enough to be a significant loss for these prospective AI’s quests for world (sc2) domination
Or better yet, imagine zerg where you can burrow every unit.