I don't want to reopen the 'EU have moved debate' but will just say 2 things:
1. I can absolutely understand that the UK have moved to a position that the EU had previously offered. Unfortunately May's skills at negotiation and political nous led to her (I am sure much to the EU's amazement and gratitude) refusing that (due to being in hock to the DUP) and giving the EU something far more valuable to them.
2. That new position - May's all-UK unfettered backstop - became the EU's (much improved) position and it was set out in the WA that was agreed.
The EU really wanted that WA as it removed from the EU all and any risk to them of having an independent UK just off its shores and able to be a competitive. They therefore took the stance that the WA was closed and would not be reopened in any circumstance.
Given that the EU really really wanted the unfettered backstop and have decided to step back to a previous position is down to the fact that they faced a UK suddenly displaying a whole lot more backbone than previously and the risk of a No-Deal outcome suddenly became a genuine possibility.
It is - IMO - simply not worth discussing whether the EU moved or not - they stated with utter certainty that they would not reopen the WA and they have - so patently they have moved - from a better position for them to one that they are still happy enough with.
Your repeated stance is that you seem not willing to accept that simple fact and just want to repeat that this was a position previously proposed by the EU. Whilst that really has no relevance to the point being made - I can see why it is a place that some posters can feel to take refuge in.
Anyway, I will move on from that.
BTW - genuinely good to see your increasingly pragmatic view of things generally mate