Hi there,
It seems this changeset added a 'highway=path' tag or equivalent to any of the XC pistes operated by Tahoe XC that didn't already have one. To my knowledge riding in this area, many of these XC pistes don't have any trail they're following in the summer, and summer-use heatmaps (ie, Strava cycling & running) don't show any use over these routes in the summer either. When these pistes don't follow any underlying road or trail, they should not carry a 'highway=' tag with them, just the 'piste=' tags. Ski piste tags will not render on the main OSM tile map since ski runs are considered out of scope for the main renderer.

Best,
Bradley