I just read the MoU (https://web.archive.org/web/20220122173201/https://canada-un...). It is a ridiculous document, suggesting that CU and the central government will form a joint committee to set Covid policy together. But nowhere in the document do I see anything about calling an election, dissolving the government, or being beyond any constitutional powers. The Wikipedia quote upthread does not seem like an accurate summary of the MoU.
Obviously it takes some suspension of disbelief to take anything in that document seriously, but it suggests that the Senate and Governor General (both unelected) make up the new "Government of Canada", with no mention of the House (elected). It's pretty clear that the intention of the "offer" is to remove the duly elected government from the picture in the mistaken belief that the Senate and GG are of higher authority to the House.
As far as the petition for an early election goes, I agree I can't find it in the MoU. Perhaps it was reading between the lines and combining statements made outside the MoU with what was found within.
