No, he means the combined (fee/tx * price * tx/block) metric must increase by 250x. So if, for example, average fees increase by 2.5x and price increased by 10

No, he means the combined (fee/tx * price * tx/block) metric must increase by 250x. So if, for example, average fees increase by 2.5x and price increased by 10x, then transaction/block only needs to increase by 10x in order to raise this metric by 250x. Not only this is possible, but this is likely. This metric has increased by 1,000,000x in the last few years, why would it suddenly plateau right now?