I asked my Thai gf to translate what's in that announcement: "Apply to extend all visa (Apply from now til 26 Sep) the next visa will be start from 27 Sep."
You might be right, however, this statement doesn't say ANYTHING in terms of embassy letter required to do that. Yes, there are previous announcements saying that, but to me, sorry, it is not yet clear to which extent this last announcement replaces or adds to the previous one.
This said, I (again) appreciate all the information you shared in here however, to me, what
@Sasa *********
asked above, is 100% legitimate. If this is not for you, I don't get the meaning of treating anyone else like idiots!