Yeah, i remember reading since the middle of last year that they took full control of building their own cars frim BAIC.
This also shows Xiaomi's is really commitment to vertical integration and serious about being a sucessful high value EV company. Afterall, it wont be a good image to keep having their cars built by a declining inefficient state owned car company like BAIC who will probably dissapear in a few years at the rate the chinese car market is quickly moving forward. So it's smart they started building their own cars themselves.