"playing strong chess" would be a much less hand-wavy claim if there were lots of independent methods of quantifying and verifying the strength of stockfish's l

"playing strong chess" would be a much less hand-wavy claim if there were lots of independent methods of quantifying and verifying the strength of stockfish's lowest difficulty setting. I honestly don't know if that exists or not. But unless it does, why would stockfish's lowest difficulty setting be a meaningful threshold?