It is another Zodiac cipher that requires a small but evidence backed correction in interpretation to fully solve.  He made a mistake in terminology.

IN THREE AND THREE EIGHTHS RADIANS TEN is the personally confirmed solution to the Mount Diablo code.  Cracked after 55 years by computer wizard David Stampher using spherical trigonometry.

Code:  https://github.com/dstampher/zodiac-z32-cipher

Website:  https://inthreeandthreeeighthsradiansten.com

Aerial drones with GPR scanners already exist.

In the future they will just send one to the triangle and it will scan it automatically

For now we must wait for the humans.

Either way, David Stampher is the finder of the triangle.  That has already been established thankfully.

They can actually do subsurface scans with satellites as well.  Although you will need to be closer to the ground to get a more accurate reading.  Still, it can be done from space.

Just waiting around still basically maybe they’ll check it out tomorrow only time will tell.