diploma, certificate or transcripts from a secondary or post-secondary education program in Canada or abroad, where the language of study was English or French
diploma, certificate or transcripts from a secondary or post-secondary education program in Canada or abroad, where the language of study was English or French
It has to be a program (so not a single course), but it doesn't say this has to be a multi-year program, or has to be a CEP or DEP, or a bachelor or anything like that. So there does not seem to be any reason why your diploma would not be accepted as language proof.
The only other requirement is that the document you send has to be in English or French. If it is not you'd need to send a translation and a letter confirming the program was in English or French. Concordia diplomas are written in English, so you're good to go.