As this is outside, I assume it is at the Fremont plant:
This looks like a rear structure.
The Shanghai/Berlin/Austin plants were built to house the Idra Giga Presses internally. Also, Tesla is planning larger castings for at least Austin with perhaps an entire CyberTruck structure.
Tesla is notorious for poor body panel alignment (inconsistent gaps, etc.). The castings are supposed to reduce stack-up tolerances for the body panel mounting points.
Apparently, the Fremont Model Y front chassis was not a single casting. The Austin production should have improved, but not yet:
Munro body teardowns of Fremont Model 3 v. Fremont Model Y v. Austin Model Y:
