Fairly confident that the trail that goes north east from this point does not exist. The trail it connects to about 1.9km later does exist.

How do I know? I tried finding it today and failed. See my Strava entry: https://www.strava.com/activities/699338707

Trail 20 is an official Gatineau Park winter xc ski trail. Having said that, it crosses a small lake which is not represented on OSM but is represented on the official Gatineau Park winter trail map which can be downloaded at the following URL.
http://www.ncc-ccn.gc.ca/sites/default/files/pubs/ncc_winter_trails_map.pdf