Strawmans and logical fallacies are not the same as government policy. This is like that meme "you criticize society yet you partake in society", it's not the gotcha you think it is.
The government is saying that the courts don't have jurisdiction because of an amendment clause in the act.
11 The Minister may amend an emissions target set under section 7 or an emissions reduction plan in a manner that is consistent with the purpose of this Act.
This is the purpose:
The purpose of this Act is to require the setting of national targets for the reduction of greenhouse gas emissions based on the best scientific information available and to promote transparency, accountability and immediate and ambitious action in relation to achieving those targets, in support of achieving net-zero emissions in Canada by 2050 and Canada’s international commitments in respect of mitigating climate change.
https://laws-lois.justice.gc.ca/eng/acts/c-19.3/fulltext.html#h-1305641
So if they are slashing their targets and quotas, that's in contradiction to the purpose of the Act, and the clause definitely doesn't fit. But, again, your bias is blinding you.