CRAGS and the Access Fund are beginning new projects to help improve access to Donner Summit. You can communicate access issues directly at CRAGS’ Donner Summit page norcalcrags.org/crags/donner/. The Truckee Donner Land Trust and the Access Fund jointly launched the Save Donner Climbing campaign, then purchased formerly private land for public conservation and access, which includes the Black Wall and other nearby cliffs, in 2015.
The technical crux is definitely getting off the ground but the mental crux is continuing up and getting clipped to the first bolt. Continuing up from here eases a bit but is still good, fun face climbing. Although the runout to the top is quite far, it is not that difficult. You could veer right to easier ground if need be. Although Carville's guide shows the climb to go straight up to the first bolt, I think the climb starts about 5' right of the bolt and goes straight up finally gaining good holds even with bolt and then a reasonable traverse left to get clipped. Going straight up to the bolt from the ground looks much harder than 5.9!
The Slide is the right-most climb on East Face and is found just right of Unknown about 20' right of the right slanting climb called The Slash.
Two widely spaced bolts protect the route in a typical Joshua Tree style. Two new bolts with chains act as anchors and rappel bolts.