Is this an open tuning?

General
1

If so, do you know what it is?
https://www.youtube.com/watch?v=WIF4_Sm-rgQ

2

Capo at the 5th fret I believe, standard tuning

I love this version
Jeff was a studio guitarist for a long time before taking up the singing mantle
Hard to believe with a voice like that

3

Really? Had no idea. Marvellous talent.