This change is solely meant to make alliance and confed limits the same. Later rule changes will address private farms.
I, and other ambassadors, are well aware that techs are being used for garaging too, and especially I have brought it up with TG. For now though, they first wanted to focus on private farming. But they agreed to look at other ways of teching too later on.
How can you keep at least 1.5m attacking troops without needing alliance/friend/tech to feed ?
They should think of increasing corp production and then no one will think about using other villages to garage in.
Like allowing villages to rise field to lvl 12 and capital to lvl 22 or even more (by decreasing the required materials or increasing warehouse capacity).