This is misinformation. One cannot "lose" PR status. It is entirely possible that a permanent resident who does not meet the residency obligation will be issued a PRTD. Once a PR presents themselves at a Canadian port of entry, CBSA is required, by law, to admit that person to Canada, regardless of whether their PR card is valid or they have meet the residence obligation. (There are many ways a PR can arrive at a PoE, including by land, sea, private carrier, or even oversight by an airline.)
A PR who has failed to meet the RO will be admitted to Canada if they present themselves at a PoE. CBSA is not required to refer to IRCC a PR who seems to fail to meet the RO (note that CBSA is not authorized to make a determination of the ongoing validity of PR status). If a PR who failed to meet the RO enters Canada and manages to meet the RO without IRCC being alerted, then the PR would no longer be at risk of having their PR terminated for not having met the residence obligation.
Holding PR status and failing to meet the RO is not meaningless. It remains meaningful, in that the person remains a permanent resident of Canada.