Can you please check, what address is showing on their ECAS profile:
https://services3.cic.gc.ca/ecas/security.do?lang=en
Also, call them to see what's their address is.
Just my opinion, if they can stay in Canada, go for it, wait a little more, and hopefully, they can get their eCOPR/PR card soon.
1) can i submit the passports still with the Feb3rd Letter???? Explaining the situation??
If it is still showing their home country address, then
feb3rd- Received PPR - >This letter is now expired and you need to request a new one, with an explanation that they were in Canada.
If it is showing your Canadian address, then
You need to change their address back to their home country address again and request a new one, with an explanation that they were in Canada.
2) if i update their home country address again.. what are the chances we will receive PPR before Aug 5th??
There is no SLA set by IRCC. It can be done in one month or it can take several. It's pure luck.
Just FYI:
Here is the recent policy change which is set to expire on March 31, 2022, (For only in Canada Applicants)
https://www.canada.ca/en/immigratio...ices/public-policy-extended-medical-exam.html