While the post you quote is nearly ancient history, and in particular there have been major changes in the law governing grant citizenship since then (at that time the presence requirement, for example, was still a minimum of four years out of six), this is not something that has changed much. As I said many years ago, which you quote, if there is some indication of international travel during a period of time the PR did not have a valid passport, that's what would raise red flags. Otherwise, and especially during the Covid years, not renewing a home country passport should not raise questions.
That said, I do not agree with overly broad statements like "Canada doesn't care if you renewed your passport." Sometimes, in some circumstances, Canada does care. If the immigrant obtained status in Canada as a refugee, for example, renewing a home country passport is evidence of reavailment of home country protection and grounds for cessation of status. And, as the instructions clearly specify, if a PR has renewed their passport a copy of that MUST be included with the citizenship application (suggesting that the government does care eh). But the main thing, again, is as long as there is no indication of international travel during a period the PR-citizenship-applicant did not have a valid passport (or other travel document if applicable), that will not raise questions or concerns.