The purpose of the extension was to reduce the risk of a no deal Brexit, which Johnson didn't want but was at risk of stumbling into in his efforts to please ul

The purpose of the extension was to reduce the risk of a no deal Brexit, which Johnson didn't want but was at risk of stumbling into in his efforts to please ultras. Parliament succeeded in its goal, which did not require any of the things you claim. With the benefit of hindsight, it all worked out well for Johnson: he cowed the party, could renegotiate without much fear of the ultras, and could choose the circumstance of the next election to his best advantage. The methods he chose to achieve this, though, greatly weakened parliamentary sovereignty.