My understanding of that is that there are different kinds of limits depending on the legal entity.

Contributions to political parties are limited, and that is constitutional per Harper v. Canada.

With respect to the recent struck down Ford enacted Ontario law:

• If it’s a political party themselves spending, then their limits were more liberal.
• And if they’re third parties, the limits were restricted. This was unconstitutional.

Again, this is just my understanding. Please corroborate against other credible sources!