Can you opt out of preview builds post-RTM?

I thought you can. If you are using a post-RTM build, there is an "stop insider builds" button. So, that never works for me.

I made a system image on RTM just in case.

I asked MS and they gave me a complicated answer. Kind of yes, kind of no, maybe.

The second question is, say you have RTM, you opt back into builds so you can test one or two, say you somehow do manage to opt out, will you automatically get pushed up to the next milestone in post-RTM, e.g. TH2?

Thanks