There is a separate forum here on the residency obligation as it's a somewhat complex topic.
https://www.canadavisa.com/canada-immigration-discussion-board/forums/permanent-residency-obligations.11/
Quick key points:
-PR status does not expire; the date of PR card has nothing to do with it.
-note the 2-in-5 requirement is on a rolling five year basis (at any point in time).
-there is no general 'loosening' or flexibility due to the pandemic (and in my view not likely to be).
-there is already a framework in place that requires examining officers to consider humanitarian and compassionate considerations (or exigent circumstances if you prefer).
-'examination' occurs primarily at a port of entry - i.e. a PR who enters who is not in compliance will have a chance to present/explain their circumstances (which
must be considered). (If the examining officer agrees, can wave through; if not, start the process of saying not-in-compliance and potentially revoking - but will be admitted to Canada and allowed to appeal). It's at this stage that "covid made returning hard/impossible/scary" would be considered. (Not guaranteed will be accepted - perfectly understandable perhaps to be out of compliance by a month, but less so to claim return to Canada was delayed by a year because of covid.) Details of individual cases matter.
-Not to over-generalize, but PRs who are only slightly out of compliance are often given the benefit of the doubt and waved through; those grossly out of compliance - less so.
-When IN Canada, if not travelling abroad, a PR who is out of compliance can remain in Canada, is in Canada legally, and few negative consequences to being out-of-compliance and can stay until back in compliance.
-BUT: PR card, when expired, cannot be renewed until back in compliance. And PR card would be needed to return to Canada.
-Travel in and out of Canada when out of compliance runs the risk - at every border examination - of the non-compliance being an issue and the process started of revoking the PR status (subject to appeal, etc); previous leniency for non-compliance does not apply to future examinations. This may be a serious constraint for those who wish/need to travel frequently.
So all told: it's still in your interests and that of your spouse to return early enough to be and remain in compliance. That includes leaving enough 'buffer' for compliance taking into account planned and unexpected travel.
For many PRs, the issue of being able to travel on an ongoing basis - keeping in mind the need for valid PR card, RO compliance, etc - means having a buffer of physical-presence days to account for planned and unexpected travel.