I asked about the lag and they responded with this tweet. https://mobile.twitter.com/#!/collusionapp/status/2083668457...
The laggy footage starting at 0:28 looks like real-time to me. You can see the crosshair falling behind at 0:35 too, and that's clearly normal speed unless the guy can do handwriting in slow-motion. And I can't think of any way a high framerate would affect the perception of lag when played in realtime.