"I should mention that I had a poor score on IELTS and receive only the minimum 2 points out of 16"
Certainly sounds like you are talking about yourself and not your brother-in-law! No problems with your posting on his behalf but it would have been less confusing for us if you had told us that to begin with!
Anyway, the bottom line is in my view CIO eligibility review MAY allow your brother through if he has 67 points, since they tend to be very operational-manual-centric. However, I believe the visa office and the immigration officer reviewing your brother-in-law's case would refuse it at his/her discretion with such poor English skills.
To be honest, if I were reviewing the case, I would refuse it too. It would otherwise be unfair on the applicant because they would really struggle to get a job with such poor English, and unfair on the Canadian welfare system which would have to support them if they did not get a job.
Reasonable language skills are a very important component of deciding if someone should be allowed to emmigrate.
So my advice stands - tell your brother to spend time and effort into improving his English skills.
Best of luck,
Wayne.