rf-loop
What you see is a product of fast touchscreen demonstration with NO clear defined intent. (like some old Dave video of fast turning of knobs)
With such a swipe of a finger up and down the display both Ref and Atten levels can be affected and Jason's actions show this well.
But, when a finger is placed on the sweep waveform and raised or lowered with clear intent only the Ref level will change.
hendorog and I have just explored this issue
without any attempt to adjust touchscreen properties from factory default.
Until I explore how user touchscreen settings might affect what you see in Jason's video I cannot call it a bug, only fingers working faster than mind.
Not ideal I know for an SA but a wireless mouse and keyboard works just fine with SVA.
I have my SVA back now but lost my SSA to hendorog .......again.