My impression is that Tramitichromis typically have 3 blotches/spots on their side, where as this fish doesn't appear to have any blotching (which the blotches do disappear in males when they color up), but it displays a dark lateral line (thus it's not full color, so I'd expect the blotches/spots more so than the dark lateral line).
I did find one instance online of a dark lateral lined individual on a sellers website (blue grass FWIW), but found many examples showing otherwise showing the 3 spots or blotches. It also wouldn't be the first time I've seen inaccuracies on a retailers website.
To suggest an alternate species, it could be Chilotilapia euchilus "Green". Do you recall ever purchasing one of those? I know I had some younger individuals at one time, but I can't recall selling any directly to you. I know Wet Thumb Aquatics was breeding them for a long time, once upon a time and they've been available locally. I've seen others on here list them from time to time (Marty for example IIRC). If you google for example C. euchilus, there aren't many good examples of the "Green" version. There are plenty of the, IMO better looking, standard C. euchilus that displays more yellows/reds/blue/and a little green.
