About the size of JET. It's definitely practical in the sense that we can build it and it's likely to produce overall net power. Whether it will be competitive is another issue, and for that I agree with you that other designs, like Helion, have a better shot.
That's not a definition of "practical" that I would use. "Possible", perhaps, but practical implies effectiveness and suitability, and without competitiveness that isn't there.