Academy Manufactor’s substitute impact applies to making a token copy of any of these creatures being created, and as a substitute of getting a replica of that creature, you’ll create a Clue, a Food, and a Treasure token every, none of which being any greater than the fundamental model of that token.

Academy Manufactor’s means is a substitute impact, which roughly means “if one thing would occur, it would not occur, and one thing else occurs as a substitute”.
This actually is a greater rationalization than any guidelines quote would give in my view, nonetheless if you wish to learn additional, there’s this wonderful web page on magicjudges.org on the subject, and naturally for completeness’s sake, a related guidelines quote:

614.6. If an occasion is changed, it by no means occurs. A modified occasion happens as a substitute, which can in flip set off skills.

Two circumstances should be true for a similar everlasting to ensure that Academy Manufactor’s means to use:

• the everlasting must be a token
• the everlasting must have the Clue, Food, or Treasure artifact sort

Both occur to be true for the creatures talked about, so this maybe uncommon interplay occurs.