Canadian investment immigrants: Will the Immigration Bureau go directly to the Inland Revenue Department to check the tax payment?

Immigrants have this right, but not directly. They must be suspicious and apply for the approval of the court before they can go to the tax bureau to check your tax return.

Basically, Canadian forms and materials will have a line that says "protected after completion", indicating that this material is protected. Even the same government department can't access your information, and it can only be provided to people who want to see it if you agree or the court requests it!

So the answer to your question is "no"