Map making in AoE games is not modding, I just explained it to you. The scenario editor is a tool to modify the game, to create things that the game would otherwise not let you do. Again, as a long-term games modder, I disagree. You’re trying to argue that the scenario editor is a fundamental part of the game, and as such (among other reasons) the game is incomplete. This all came out of you trying to contradict me pointing out that mod tools are not required for a game to be “finished”. If you want to still insist that map (or scenario) making isn’t modding, that’s entirely your choice. It contains instructions on how to make anything - from maps / scenarios, to tuning (data) mods, to vehicle skins (and more).

To give you an example, here’s the official modding documentation for Company of Heroes 2. The Steam Workshop demonstrates this by putting custom maps alongside texture packs, data mods and everything inbetween (depending on the game and the level of modding support it has). With the stuff the developers made for you, in your own words. Many areas of games modding are done with the help of tools developers explicitly provide. I don’t know why you’re trying to explain modding to me, maybe it’s a weird Age-specific thing that I’m not aware of, but mapmaking is widely considered to fall under the umbrella of “games modding”. The definition of modding is to change the software or anything of the game which is not originally conceived or intended by the designer.

Company of heroes