No CalDAV push in Fantastical 2 for Mac?

I’m a long-time BusyCal user on macOS, but I thought I’d take a test drive of Fantastical 2. I use Fastmail for mail and calendars. In setting up Fantastical, the first thing I noticed was that it doesn’t seem to support Push updates for Fastmail’s CalDAV service - only timed refreshes.

BusyCal supports Push just fine.

Am I missing something, or is this something that Fantastical simply doesn’t offer?

First impression is that I am staying with BusyCal!