No, definitely not. This will result in refusal and loss of your PR status. You must have at least 730 residency days on the date you submit your application. The number of days is locked on the date your application is submitted. There is no credit given for days after application submission.
I think this is overstating the case. I agree with the advice that it is NOT wise to apply before meeting the RO requirements, and it CAN result in loss of PR status and a refusal.
But do we know this with certainty, in all cases? No. Do we know with certainty that the number of days IS locked on the day the app is submitted? I don't know that; please show where this is the case.
We DO know this is the case in some instances - eg citizenship app days-in-country very much DO depend on date of submission [indeed signature?]. We DO know that WHEN a 44(1) is prepared, it can get frozen as of [some date in the process] - but we do NOT know that a 44(1) is initiated in every case where a PR out-of-compliance applies to sponsor a spouse/child. Indeed, I'd say we know that in some cases it doesn't happen (but we can't say for any reason more than luck, as far as I can tell).
Let's not overstate what we know - although I recognize that often such overstatement might be intended for good reasons, since (clearly) some PRs don't understand (want to udnerstand?) that such ambiguity does not mean it's a good idea to risk it.
Here's what I think we do know: simply put, that yes, attempting to sponsor while out of compliance CAN result in loss of PR status and/or severe delays (leaving out the process by which this happens). But it is not automatic ('self-executing' is one associated legal term). The laws and regs say (as best I can tell) only that a sponsor cannot be 'inadmissible', but there is no automatic determination that one is inadmissible.
Someone - IRCC - must actively make that determination, and WITHOUT having automatically to hand some or all of the info needed to make that determination. The sponsorship form does not have the day count in it, and there is no H&C infrmation (q here about whether they must ask for and get it in order to finalize the 44(1) - probably).
Note: I'd say that the day count of days-in-Canada for RO is absolutely the easiest information for IRCC to access if they decide to do so - particularly for the MANY cases we see here where the sponsor has clearly been out of Canada for years before applying to sponsor.
Again: I don't think it's a good idea to apply to sponsor before in compliance, and I think if doing so, it's both risky and largely pointless (because IRCC will likely delay the processing until the PR-sponsor is clearly in compliance again, so no net gain).
But I don't think it's as certain as some here would like to believe.