Thumb on the bass notes (E & A strings), fingertips grazing down & up on the upper strings.

|--------------------------------------------|
|-----5-5------5-5------5-5--------5-5----|
|-----4-4------4-4------4-4--------6-6----|
|-----6-6------6-6------6-6--------7-7----|
|-----7-7------7-7------7-7-----7---------|
|--7--------7--------7---------------------|

He's using a capo at the 4th fret to use C & F open chord shapes to play E & A chords.

Anders covers this technique in this tutorial from the acoustic course.

https://www.guitartricks.com/lesson/29236

Hope that helps!