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It's all about where you draw the box, but yes, the general conclusion is correct. Other contenders might be AWS, Google, BOINC, and Folding@home.
"A FLOP is not a FLOP" is a common statement in academic computing. Not all computing problems are neatly measured by FLOPs, and your performance (and the energy or number of math solves required to answer a question) are going to vary across hardware.