Is this true? I can't find a source about only delegates being allowed to vote. An ex-conversative friend of mine was saying that they usually send the ballots out by mail to any member in good standing.
Edit: doing more reading I don't think its 100% fair to compare this to NDP election. This was a leadership review not a leadership election. If PP lost this then a leadership election would happen that works basically the same as NDP leadership election in terms of who's allowed to vote. Second the NDP has similar rules about delegates to NDP conventions as far as I can tell. You can read both their constitutions here
https://xfer.ndp.ca/2023/Documents/Constitution%20EN-2021.pdf
https://cpcassets.conservative.ca/wp-content/uploads/2025/10/30091347/c5855d471341cf9.pdf