This is bad information and completely incorrect. To qualify as a sponsor, a PR MUST be physically living in Canada. This is above and beyond the residency application. We have seen plenty of examples here where trips of a few months resulted in an application refusal. Based on what we've seen here, if you keep your trips under a month - you're OK. If it's longer than a month, you are jeopardizing your application.
If your husband was able to visit you as a PR for months at a time while your application was in progress - then you simply got very very lucky. If CIC had found out, you would have been refused.