[beerandt]

No- there would be a solid shadow down the right side of the structure (look at the right side of the bigger hanger in the zoomed out image).

The simple explanation for the shadow is that they left the solid end (wall) of the structure up. (They're often made of a different material like aluminum, or are otherwise more difficult to disassemble due to doors or other things mounted to a semi-permanent wall.)

(ETA: If you look closely at the very top of the shadow, it appears to be a fabric/tarp wall that is sagging slightly at the peak and not attached at the very top of the arch. You can see the shadow of that portion of exposed arch/ frame pretty clearly above it.)

Having the painted-on jet shadow match the actual time of day shadow I suppose is doable if they wanted to deceive a specific satellite passing overhead at a known time, but I doubt it, since it got seen multiple times over at least 3 days.