Folks,
Funnily enough, parallel simultaneous approaches have been the norm at KSFO since the place was built --- that is a long time ago.
Separation is fundamentally handled by the LOTW system, apparently unknown to many Australian pilots.
What do you do with the TCAS in that situation? Put it in TA?
As you do (SOPs -- aircraft/equipment/airline operator) in any area of high density traffic in the approach/departure area.
Now I've watched the video...the lead landed long!
Funnily enough, some regard it as normal operations to cooperate with ATC, and arrange their operations to vacate the runway in minimum time. When you have 10,000+ to play with, and it can safely be accommodated, a "normal" touchdown at the threshold is not necessary, aiming to a displaced threshold is not unknown.