Unless Semi will be produced at the new facility near Giga Nevada. That's where the prototypes and alpha builds were assembled:
The long awaited Tesla Semi has entered a limited production stage at the Tesla Giga Nevada site, according to a new unofficial report.
insideevs.com
Here is a drone flyover of the Tesla Gigafactory 1 in Nevada, which besides its core battery production, is also engaged in other products, including the Semi.
insideevs.com
BTW, nothing wrong with using 2170s for Semi, especially if Panasonic has the volume capacity and can deliver on the cost. Moar 4680s for moar Cybertrucks!
Cheers!