You may find this thread interesting. 'quicksilver' was a USMC Harrier pilot:
View topic - UK MOD in a muddle over F-35C - Program and politics (f-16.net) ME about SRVL HUD video: "
Perhaps SRVL braking method has changed, with nozzle not being used? SRVL under test to this day, with few approaches. Note the NOZZLE ICON - left side btm - in the first video. The nozzle goes to 90deg as engine goes to idle under brakes...." & 'quicksilver': "I believe one must pull the LHI (throttle) aft out of the detent in order to command nozzle positions forward of 90 degrees. But, as you suggest, I doubt it’s [PNB] needed at such slow touchdown speeds." An HUGE amount of SRVL info here: View topic - F-35B UK SRVL info - Updated when new/old info available - General F-35 Forum (f-16.net)
Some SRVL info in PDF format 155 pages at SCRIBBLYDIBBLY:
https://www.scribd.com/document/3457...ril-2017-pp155