Unlocks AAI Loaders with the same technology as their matching splitter.
That does not mean you can craft them once they are researched as you probably lack the ability to craft the necessary circuit.
Does NOT support Krastorio 2 at the moment. (It might load but you will probably be locked out of researching the techs for t4 and t5 loaders.)
Check out AAI Loaders with Belt Research (Refactored) for broader mod support.