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But he’s said in C major which simplified the whole thing.Actually there’s a huge likelihood that if you encounter that it’s modulating from C to Am.
And no it’s not a secondary dominant because it is the primary dominant in Am.
The F7 can be subVofV. However it really comes from being subdominant.
As in the Ⅳ-7 Ⅳ-6/Ⅱø7 ♭Ⅱ△7 ♭Ⅵ7
D-7 D-6/Bø7 B♭△7 F7 in Am.
So that F7 isn’t coming from the world of C but Am.
Alternatively F-7 F-6 B♭7 D♭△7 A♭7 are minor subdominants.
Meaning they are chords from C- used for swapping out the subdominant and/or dominant in C.