If you're talking about clause 3 removal, it would not affect first nations directly, but the idea is that there is an obligation on both parties, first nations and the Government of Canada, to act in good faith and to ensure that they're carrying out their duties properly. If they act in bad faith, for example, there would be no coverage. If the Government of Canada acts in bad faith, it could be sued. It would have no protection from liability.
The idea is to indicate that as long as the government is acting in good faith, it's protected from liability. In a similar situation with respect to first nations, as long as they're acting in good faith, they're also protected from liability.