No, most American Charvels with non-painted headstocks have black logos. That is a prepro logo though - smaller and it doesn't have the "Made in USA" under it or the "T. M." next to it...
This looks legit. If this was several years ago, I would have already been to see it and bought it. Boogie Bodies logo on neck heel makes it seem real legit for '78 - '79. Also his story about ordering from Wayne in '78 and having to pick it up from Grover sounds legit with the timeline of Wayne leaving the company.
As for a vintage style trem on an Explorer body, what other trem options were there in '78-79? This was probably radical as hell having an Explorer with a trem at this time.
I think it's pretty cool
I would much rather have a Hamer Standard that looks like this from this era though.