From the description it appears as if this mod mostly removes things that do just one thing. Is that it or does it also make other things/recipes easier? For example the recipes added/changed by AAI industries that are mostly relevant in the early game?

Yes, it mostly removes single purpose items and buildings. Some other things it does is move some simple recipes to smaller buildings e.g. the biochemical facility is way to big for simple chemical recipes, and made some recipes easier e.g. data cards that have a % chance to make the card.