I imagine you notify the government and ask whether it wants to provide a statement as part of the announcement or would like to be present. There is a bit of ambiguity there; the Canada Infrastructure Bank is said to be independent, yet the government is there when it suits them and not there when it doesn't. I assume that in this case it didn't suit the government, but it seems that you weren't told that, even though it was said to the committee.
Even if your decisions don't suit the government, it doesn't have the power to overturn them. Is that correct?