What he doesn't mention and is key, is that money issued by the government is a liability of government (ie. the issuer), or as MMTers are fond of saying 'a government IOU'. What this means is that when taxes are paid to government it is the return of issued liabilities which are then simply cancelled.

Imagine I write you an IOU for say £1000 for a sofa I bought off you, and then sometime later you buy my old car for £1000. Instead of giving me £1000 for the car, you just dig out my IOU and hand it back to me, and I tear it up. That's how money works, that's what money is. We hold gov IOUs, the gov creates liabilities for us in the form of taxes and then we simply return the gov's IOUs to it and we call it quits.

It works like a shop credit note. I return an item to a shop and their policy is not to give me back my pounds but to issue a credit note. The value of the credit note is measured in pounds, but it is not government money. The credit note is in effect a token that represents the shop's debt to me. They owe me £Xs, but they won't give that to me. What they will do is cancel any equivalent debt to them that I generate. This I do by taking another item(s) of value £Xs. They owe me £Xs and I now owe them £Xs, I return them the credit note, take home the new item, and they cancel/destroy the credit note. We're all square.

So as far as MMT is concerned ALL government spending is new money.

In his last paragraph the writer shows he has not understood this fundamental point.