Yesss

Does this affect AI aswell?

This mod is the one that increases the research time the most (x2.5 compared to vanilla), and it can be too long but still in reality the standardized legionaries would appear in a later timeframe. In any case there there are buildings like the library and personal skills that improve the research rate, and there are a couple of submods linked in the description that are a mid-term with x1.5 and x2 so you have more options.

This mod is good for big campaign, but for other DLC is a problem, I have noticed that the campaign of Divided Empire, the investigation times are too long in Para Bellum and this mod increases them even more, for example, to obtain legionnaires, the average age of the protagonists already exceeds 70 years and it is tedious to have to wait so long to have decent troops. I think that in this particular DLC due to the age of the characters, the research in some fields should be shortened, or make the characters younger (which I think is a better option).