You aren’t looking at it correctly.
I did the old course, it was ~15,400 feet of climbing. The new route cut out ~2800 feet of climbing (Carson pass 89/88 Junct. to Carson Pass | Strava Ride Segment in Markleeville, CA).
The new route is roughly 12,600 feet of climbing.
And here is Peter Stetina’s ride of the new route showing 14,000’ (I think his Wahoo may have overestimated the climbing):
Copying Stetina’s ride as a Strava route, exporting as TCX, and uploading into RideWithGPS gives 13,600 feet of climbing.
The other ride:
Pretty sure its about 13,000 feet of climbing.