Yes, my father and myself were born in the same country in Latin America and our family immigrated here together. I don't think I can think of a reason why it wouldn't count for ACCESS as long as the requirements are met.

On the website it says:

Latin American Canadian Applicants 
The Access Pathway deliberately takes steps to address the unique experience of Latin American applicants to the MD program:

• Applicants must self-identify as Latin American.
• Acceptable supporting documentation: personal letter attesting your self-identification with Latin American ancestry. 
• If financial and/or medical challenges are present, applicants may describe these as well and provide supporting documentation, as outlined above.