No, the regime has been very publicly saying 'there is no deal', more so than US Admin who keeps hinting 'a deal' or 'imminent' or '95% of the way there'.

"Trump is now doubling down on U.S. demands and threats of more military action. "

No - he's been backing down over and over for weeks. There limited strikes today.

The US Admin is wary of escalation, Tehran knows it (or seems to be acting as though they believe that) and are dragging this along.