Thanks
@chumley for the map!
I decided to spend some time studying maps, and have drawn the following conclusions (not that they are necessarily the correct ones!):
1) The only logical legal access would involve improving the road through Dark Canyon (Edit: Some maps call this Telegraph Wash) (this is an extension of the rd on Chumley's map that heads almost directly south after a quarter mile jog southeast from the old ranch buildings (mentioned by
@big_load).) This is the only viable existing road to the land purchase that is not traversing the San Carlos Reservation. This section of road is only about 2 miles long and meets up with the existing forest road system a half mile east of Black Canyon Trailhead. It would not be hard to improve this section as it is almost entirely in a wash.
2) The complete road access isolation of the North Santa Teresa (due to the reservation closure) is almost certainly the claim for the 32000 acre number dished out. However, this is misleading. Santa Theresa is ~26000 acres and North Santa Theresa is ~6000 acres.
In reality, they are only improving access to Four Mile Canyon Trail, and off trail areas within the Four Mile Canyon basin. This access for hikers and sportsmen is only more easy for about a fifth of the overall North Santa Teresa wilderness and a 10th (being generous) of the Santa Teresa Wilderness, so a realistic number for improved access would be roughly 3800 acres. In my opinion, the other areas of North Santa Teresa and the Santa Teresa Wildernesses remain more easily accessible via the existing hiking trail system and existing trailheads (including the GET.)
3) There are 3 different poor quality ranch roads that branch from the road mentioned under #1. These roads are heading west about 0.8 miles (1.0 miles for the northernmost one), leading to a tank at the (old) start of the Four Mile Canyon trail, and it could be any of those 3 that were also improved. Based on the video it looks like the parking area is likely along one of these roads. You can see the road continue but be blocked off from driving in the video, and I didn't see the tank in the video, leading me to believe the parking area is somewhat closer to Dark Canyon/Telegraph Wash.