No Flops are floating point operations. GPUs are better at them because they run floating point operations in parallel on thousands of optimized cores. While python will run a floating point operation serially on (likely) a single general purpose CPU core. None of this really pertains to websites where the main bottle neck is IO so python is as good as anything else.
I think it's a joke, they're likely aware of what you said. It's also possibly a sarcastic way of pointing out what you said, that a lot of things Python is used for are things where the main bottle neck is IO, so things like this should be read with such context taken into account.