Even the very first point of Paul Mason's guide looks wrong:
1. Win the battle for credibility over tax and spend. Explain why borrowing to spend money on long term infrastructure is the only way to rebuild our country.
If borrowing to spend is the way forward, that does not support a call for a regime of tax and spend. He is carefully explaining the fallacy of his own message.

Of course, if he meant that to be two separate messages he could have separated the points out. But it is not clear that that was his intention.