SMETS 1 gas meter now dumb after upgrading electricity to SMETS 2 meter

As per the title, I switched to EDF for electricity and they offered me a SMETS 2 meter. As I am on a ToU/EV tariff and there has historically been some communication outages I decided it was a good idea.

The SMETS 1 meter for my gas is now a dumb meter. Octopus have advised that even if the gas meter was upgraded to SMETS 2, they wouldn't be able to link it to the comms unit because that's EDF and therefore it wouldn't be a smart meter. I thought that the whole point of SMETS 2 was that it was meant to be supplier agnostic.

When my fixed tariff comes to an end with Octopus (in December), if I want my gas meter to be upgraded to SMETS 2 and function as a smart meter, it reads like I will have to change my gas supply to EDF.

So is this information correct? From what I've read elsewhere on the internet it doesn't seem so. It seems ludicrous if it is and my gut feeling is it's just that Octopus can't be bothered, but I'm open to be corrected if so.

This is a snippet from the last email I received after a bit of back and forth:

Unfortunately, even if your gas meter were upgraded to SMETS2 in the future, it’s unlikely that it would be able to link with the comms unit since your electricity meter is with a different supplier (EDF Energy). Part of the commissioning process for a SMETS2 gas meter involves connecting it with the electricity meter communication hub, so having different suppliers for each meter usually prevents this smart communication from working.

I don't really care about submitting meter readings manually, but it would be nice to have the ability to see my usage through an app/online account!