I don't know, this is why I'm a tad suspicious of what they are saying.
I was able to recover the details for several days after receiving the firmware patch. I can't see why them removing or adding my router from the network would allow me to retrieve other configuration data. I assume they mean that each router has unique credentials for the TR-069 request? If that's the case, why would I ever be able to recover data other than my own? I also don't see how they could manage this. The fact that the website that the router communicates with also changed doesn't support their argument either really...
Also, does this mean when they patch every router over the phone line they will also be able to do the same for several days, or was it just an issue with mine specifically?
Maybe I've misunderstood something but it doesn't seem to quite add up.