They often put up large screens for the overflow crowd.
She is now though, hence setting the record straight and trashing their fake narrative.
The twitter account if @PressSec - it moves with the holder of the post.
Yes it was /ourgirl/ Sarah Sanders (sorry jumped the gun on my first reply).
They made a thing of it back then, probably figure the normies have memory holed it. They're out of ammo, so just reusing old rubbish. Like the medical thing with POTUS/Pence.
https://www.bbc.com/news/world-europe-46179291