The prohibition associated with both CPC-142 and CPC-143 is in proposed subsection 91(1) of the bill. This prohibition says that no person or entity shall, with the intention of affecting the results of the election, make or publish a false statement.
Yes, the intent requirement is already reflected in the intent to affect the results of the election, and of course, the person committing the offence would also need to be aware that the information that is published is false. I think that adding in “knowingly” here would be adding some uncertainty in the level of proof that would be required to successfully convict someone under that provision.