Caporegime
It seems you didn't read your article:
These things are never easy but renovating these properties would be easier, faster and cheaper than trying to build new ones. As to insulating them, we don't live in a period where everyone has well insulated homes. Most don't. I think most people would be more than happy to be in a house that is a big more expensive to heat than one that was more expensive simply to exist in. They would be doubly happy if they owned it instead of renting.
I would also argue that insulating terraced houses is the easiest of all houses to do. You can do external insulation and you only have a few walls to do instead of 4 or more.
After some really bad encounters with vile landlords, i'm firmly of the belief that landlords should be referenced just as much as tenants. Luckily i'm in a position right now I have a unicorn landlord.
I don't know if you can be banned as a landlord. You probably should be.