I think if the PA's IELTS test date is indeed valid, you shouldn't worry too much right? They clearly stated that language test results are valid for 2 years, and you have the official letter issued by IELTS committee, that's the hard proof right there.
I'm not sure about your 2nd situation regarding the Canadian education credential, it appears that you claimed it's post-secondary right? You mind sharing what kind of education credential it is? Is it a 2year,3 year or 4 year degree/diploma issued by a Canadian university or college?