Sorry bro, but this was intentional omission on the part of the applicant. They knew that declaring an MBA can adversely affect their chances of getting a SP for a PG diploma hence the omission. They 100% knew why their lawyer suggested it and they went along with it. IRCC is not stupid (well they kinda are, but not in this regard
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
), they see this trick all the time, and if this degree is included in any application going forward, it would most likely be flagged as misrepresentation = ban.
Even if they do not claim points for it in their PR application, simply mentioning it in the Personal History will raise suspicion cos a degree is not something you randomly forget to mention, especially in a study permit application.
I agree with the advice to lawyer up.