Indeed. So much the better if you raise the issue with Mr. Goodman. The fact remains that your lawyers are involved. In the brief filed with the Federal Court, the defendant is listed as the Minister of Citizenship, Immigration and Multiculturalism. That's you, not the IRB.
The IRB made a mistake. As minister, you could have acknowledged that there were mistakes made in the interpretation, that it was unacceptable and that proper interpretation services should have been provided.