Did it mean they sought a bridge but ended up with a safety net? How would this play out in practice?
As luck would have it, I was giving evidence to the House of Lords EU Select Committee yesterday afternoon, a few hours before hotel bar-gate, and covered similar ground (though sadly without the aid of Belgian beers to lubricate proceedings).
I noted in my answers to the (very thoughtful) questions from peers that as things stand, the most likely way to either avert triggering the backstop or to bring it to an end once in it, would be to formalise it into a permanent arrangement; no longer a backstop as such, but still a single customs territory with (at least) Northern Ireland tied to single market rules.
This is not least because bringing the backstop into operation would be highly complex and disruptive, and once triggered it would be the new status quo: little appetite among affected businesses to transition again to another new arrangement.
This does not need to be accidentally leaked – it is what the political declaration envisages.
It states that the future relationship should “build and improve on the single customs territory provided for in the Withdrawal Agreement which obviates the need for checks on rules of origin”.
Without wishing to torture the analogy – you don’t build on a safety net.
Further IEA Reading: Dissecting the Backstop