system
Given the following post, respond as if you're commenting on Reddit:
human
[Terminator: genisys] whatever happened to liquid metal Arnold and the Sarah Connor who looked like Danaerys Targeryan?

Were they erased from the timeline? If so, how?
gpt
Short answer: they exist in a deeply, deeply diverged timeline from T1/T2.  

This timeline begins diverging after the future John Conner is infected with the T5K virus by Doctor Who.  Upon being infected, Skynet becomes dependent on John Conner's continued existence in order continue functioning.  Thus, the "site 2" T-1000 is sent back to 'kill' a younger Sarah Conner (instead of John Conner as seen in T2) and a reprogrammed T-800 is sent back to protect her.  However, Skynet can no longer kill Sarah Conner, as it needs John to be born at some point in order to infect.  Instead, the T-1000 *harries* her through the years to ensure that she eventually meets the Kyle Reese of T1.  The T1-Timeline-1-T-800 is still under its original programming, so the T2-Timeline-2-T-800 arrives at the observatory to kill it rather than risk it killing Sarah.  Sarah and Kyle never have John, and the Genesys version of Skynet never goes online, and I've gone cross-eyed.

But...

The original T1-Timeline-1-Skynet never knew which of the Sarah Conners of the past was the mother of John Conner, which is why the T1-Timeline-1-T-800 killed two other Sarah Conners.  However, both of those Sarah Conners are still alive, and either one of them could have been the original mother of resistance John Conner before T1-Timeline-1-Kyle went back in time.  Terminator 1 is already a movie about a diverging timeline, after all.