No, there is a programme ongoing to upgrade SMETS 1 meters,
Correct! I was an early adopter, and had what later was called the SMETS 1 installed, which resulted in all the issues when switching suppliers - the switch, ought to have been foreseen, but wasn't. It was upgraded, a few years ago, to SMETS 2, I cannot recall whether it was 'over the air', or they came to the door to do it, or whether it happened before, or during my previous supplier switch, but what I do remember is that - my last supplier switch, to Octopus, but what I do remember was how slick the switch was, and they were getting meter readings, over the air, almost instantly.
During my time with SM's, I have had three sets of meters. These were the original SMETS1, where when I changed supplier, they had to also change then meters, so they could communicate. In part at least, the meter swaps, were a result of my complaints to my new suppliers, that the meters were failing to provide them with readings.