Does anyone remember the Good Old Days?
You used to be able to get a "dry pair" -- just the wires back to the exchange, and from there, on to wherever you needed them to go. No battery, no dial tone and no loading coils. "twas used for high speed modem connections, usually between two sites on the same exchange but perhaps across town from each other.
This "can't get DSL without POTS service" stuff is rubbish, probably from the Marketing Department. DSL will work just fine over a dry pair. Probably better than when sharing the line with POTS service.
Of course, here in the US, a dry pair, which was unregulated, cost many, many more times what a regulated POTS line cost. And, took forever and a day to install.