This amendment is about reporting, so it does not impose a new cap. The cap that is being enacted for the pre-election period and the election period remain in other provisions, but this amendment would make it mandatory for third parties who are required to provide a financial return after the election to disclose all their expenses of a partisan nature that have happened since the last general election. All partisan advertisements, all election surveys, all partisan activities would be captured by this reporting requirement.
On October 17th, 2018. See this statement in context.