I guess you missed the where he said he was back .
To be back means you had gone somewhere else .
No one is going to know where he is at now.
A greenscreen can also make you look like you are anywhere.
The last speech he gave in the Rose Garden on the day everyone was in DC , he was not in the Rose garden . No noise -—> green screen .
He was back from the speech. Nothing more.
Yup!