The link is explicitly made in a less-redacted copy of a 2020 briefing on "Policy Projects". After noting the need to prioritise due to lack of capacity, the briefing included a table of projects that could be deferred. Only the OIA review line is shown (the rest being out of scope of the request), but it explicitly links deferral to the new government's "electoral projects":
What were the government's "electoral projects"? Back in December 2020 when this briefing was prepared, it included controversial changes to MMP to make the system less representative, and a surprise proposal to extend the parliamentary term from three to four years, reducing the accountability of politicians. So a project intended to improve accountability was killed in favour of one to reduce it. Which I guess shows exactly how much of a priority they place on being "the most open, most transparent Government that New Zealand has ever had"...