Of course, income is only a component of wealth--no doubt the property owned is worth quite a bit--but, according to the same report, at least 75% of these landlords are still paying mortgages on their properties, and over 10% spend more than their rental income on their mortgages!
Since most landlords borrow money to buy property, then attempt to sell access to that property profitably over time, they are more like entrepreneurs than the land baron 'monopolists' portrayed by the Churchill quote above.
This isn't wealth redistribution in any direction. It's a trade. Renters get access to property without having to own it. Owners, if they are smart and/or lucky, can profit from property, but of course take a substantially larger up front risk.
And, I would be remiss if I didn't point out that Winston Churchill was from one of the wealthiest British aristocratic (read: rentier landowning) families and was born in the family home, this palace[2].
[1] http://sfrb.org/sites/default/files/FileCenter/Documents/188... [2] https://en.wikipedia.org/wiki/Blenheim_Palace