It’s not necessary. I think the CPC have some (valid) concerns that a Trump victory in November followed by nine months of him in power may have a bit of a drag effect on support for the CPC in Canada. CPC support is probably at or very close to its peak right now, and sustaining such a peak is difficult. With more than a year to go before our own election, they’re probably cognizant that the margin, while still likely to strongly favour CPC, probably won’t be quite a dismal for the LPC as it is now. Worst case they may fear being held to a minority government.
Canadian elections this fall are very much not a need, but they probably are very much a want for team blue. I have no reason to believe they’ll get what they want though, as both LPC and NDP currently stand to get blown out of the water, and both would desperately like to see CPC miss a majority.