Well guys, this is because this mod does remove it, as part of the 'integration'. No need to have a technology that gives you an item/entity that was replaced by this mod. Well that is at least the 'official stand' of the author, which is of course me.
However I can see this stand may prove difficult to uphold in the future. I did already implement a compatibility mode to not have issues with transition but it is for the items and entities only. The technology and recipe is removed either way. I guess I will make the whole integration optional for those who just want the turrets and no other changes. keep an eye out for updates.