https://sp-images.summitpost.org/64...2.1.1&q=35&s=899b803068376a187e2fce8b20911c54
This seems to be the very top of the path, just below
Port de la Glère. The switchbacks descend roughly ESE, before the trail turns NE across the scree. I think this is the same part of the trail looking up from below:
http://wns.free.fr/randonnees/Pic_Sacroux/photos/1030256.jpg
See the reddish stone of the retaining walls of the switchback part of the trail. The aerial photography on the
géoportail website dates from 2019, so the path is still there. In fact the presence of grass and a well defined path across the scree suggest to me that the surface is stable, although very steep.
There is a large fallen rock slab visible on Googlemaps just below the
Port, and a jumble of large rock debris at the bottom of the scree slope, just above the grassy slopes of the
cirque. Are those the locations you're suggesting?