it's clearly steel guitar here, no fret playing. I vote for PF with wha-wah.
the wha-wah is also sometimes used with a clavinet, or an organ, e.g. Rick Wright on Money.
about first take / overproduced recordings :
you can have a tune played live in studio with no overdubs, but it's the 15th take, or first take recorded, but after many rehersals
it's the case for many blues players. e.g. SRV's first album is obvioulsy recorded live, with the 3 guys playing together, but how many times had they played the tunes before record it ? (jams, live in pubs, rehersals, etc...)
And then, you can have a tune with many overdubs and arangements, but an overdub just played one take. e.g. the wonderful Page's solo on Since I've been loving you. The solo is first take, (recorded in the studio corridor !) but all others intsruments might have been re-recorded many times.
In this case, which one is more "spontanous" ? which one can we call "live" "first take" ? The one recorded just one time, but rehersed or played live in pubs million times before, or the one "over-produced" (with keyboards, reverb on the voice, maybe several takes on vocals, etc...) but with a fresh solo just played one time with inspiration coming at the time ?
I must admit I don't have the answer, but the difference between "first takes" and "polished" tunes is not simple as that