Taxation through reverse mortgages?

Sir in “Adapting to mediocre prospects” July 17 Martin Wolf writes “Let the cash-poor but land rich borrow their tax payments from the government and demand repayment on death”. Is Martin Wolf trying out as a modern Sheriff of Nottingham proposing the taxation through reverse mortgages?

Why does Mr. Wolf not go after the cash-rich to begin with? What does Mr. Wolf have especially against landowners? Why does Mr. Wolf for instance not go after all those intellectual property owners who are granted monopoly rights and protection by the state without paying anything special for that?