You make a valid criticism. The estimates I've used are likely upper range. But even if we're off by a factor of 1/2 (which I don't believe) I feel the point be

You make a valid criticism. The estimates I've used are likely upper range. But even if we're off by a factor of 1/2 (which I don't believe) I feel the point being made still stands. It also seems the increase in hashrate coincides with China banning Bitcoin mining? That likely puts a skew on the numbers, although I'm not immediately sure which way.