“IOW,I’ll wager that it’s the EU who will declare Britain to be out.Until they do Britain’s considered to be in...whether they like it or not.”
That’s not at all what is going on.
The EU and Boris got a deal to leave on the 31st, they are trying to help Boris get it through by denying Remainers in Parliament a delay.
The EU wants Britain out and this over, it is the Remainers in Parliament who are drawing this out.
If that is true they can simply VETO the request for delay on the grounds the request is not signed. Done
If they approve the unsigned request then clearly they are forcing the UK to remain a member despite their request to Brexit
The Remainers in UK parliament do not have legal standing in the EU and therefore THEIR request is out of order.
In my not so humble opinion