"Researchers from Tanzania".....ummm, color me skeptical.
I've seen brick kiln ideas that seemed to be a better idea than this, honestly. Could it work? I guess...I mean, large enough rocks, and proper medium to take up the empty space since air is a horrible medium for energy storage. If you're using rocks for energy storage though, I doubt filling a shipping container with bricks would be a major hurdle though if you can already afford the panels you'd need to heat them up.
These guys from Finland are working on a sand battery idea. https://polarnightenergy.fi/sand-battery
They installed some of those at Fort Carson in Colorado. I've been following the progress to see how well they work.
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