Septatonic is just a really weird way to refer to a diatonic scale, in most cases.

Literally, it means any scale with seven tones.
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I just learn the formula, apply it to a key, and use said notes on fretboard. Why? Cuz I'm not a pussy.
Yeah I dunno where you got that from, I don't think anyone uses that term, although I suppose a 7 note scale doesn't have to be diatonic...
The proper term for a seven-tone scale is heptatonic.

Diatonic scales are a subset of heptatonic scales, in which there are only whole and half tones, and the half tones are maximally spaced.