I read through until chapter 1 in that section you linked and he is pretty scathing of landlords and if I understand it correctly his argument is that landlords exist solely to soak up all extra profits above what would leave the tenant just enough to survive.
Even the father of capitalism thought landlords were parasites that only leeched off the economy
Adam Smith justifies the existence of rent as improvement in the value of land.
https://www.adamsmithworks.org/documents/chapter-xi-of-the-rent-of-land
Perhaps you’re misunderstanding the term ‘rent-seeking’ which is a different concept entitely
I read through until chapter 1 in that section you linked and he is pretty scathing of landlords and if I understand it correctly his argument is that landlords exist solely to soak up all extra profits above what would leave the tenant just enough to survive.