Did the mailing say whether the promo was from the dealership, or from GM? Either way, it might be interesting to contact them via email and see what lease deal he can negotiate. (Since he lives in the L.A. area, a drive to Dublin Chevrolet must be called "road trip!!") But, it is entirely possible (and easy) to drive from the Bay Area to L.A. down CA-99 - *IF* you are an EVgo member; there are EVgo DCFCs all down CA-99 (Manteca, Modesto, Merced, Chowchilla, Madera, Fresno, Visalia, ...). And their new rate plan is actually reasonable. Pick up the car on Sat (or Fri night) and drive it home over the weekend. You must insist that the car be completely, fully charged - explaining to them that you are going to drive it to L.A. immediately after pickup. You'd also need the DCFC option to do that drive, obviously. (If it isn't there are lots of DCFCs between Dublin and CA-99.)
The key to getting the fastest (and cheapest, since EVgo charges by the minute) is to start the charge with a low State Of Charge (SoC). At under 55% charge or so, the car will charge at the max rate (up to 55 kW). Then it will taper the charge down to about 38 kW (which is about the max rate of a 100Amp charger) until about 75%. So, If you charge from (say) 25% to 75%, you are minimizing both the charge time as well as the amount you pay per kWh. Oh, and make sure that you have changed your EVgo rate plan if you became a member more than 6 months ago - they have a new rate plan(s) available, but they didn't automatically switch people over to the new plan : you have to call and request the switch. (The new rate plans are MUCH better than the old ones.)
I would probably drive Dublin -> Fresno (about 150 miles) and charge up to 70% or so (Fresno has 4 or 5 DCFC locations, so it shouldn't be difficult finding an available plug - plugshare app will show you which EVgo chargers are in use, so make sure to put the plugshare app on your phone if it isn't already). Then make another stop in Bakersfield and fill to 70%, even though it's only about 100 miles or so (to make sure that you have enough juice to make it over the grapevine). If you slow to 55 mph up the grapevine, it will extend your range quite a bit - especially if you get behind a big rig - even at a safe distance, the 'roiling' of the air will decrease wind resistance and improve mileage (of course, behind a big rig, up the grapevine, you won't be going 55). And then you should have enough juice to make it almost anywhere in L.A. county, but once you hit the L.A. basin there are LOTS and LOTS of DCFCs if you want a quick 20-minute top-up for insurance. Now, you *should* be able to make the drive with only two DCFC stops, but I am a belt AND suspenders man, and the extra 30 mins is worth it to me to guarantee that I don't run out of juice.