what soil are you using?
does it stay wet?
Those look like they could be N def but if you are using a good soil you shouldn't have any deficiencies yet unless your roots are in poor health
could be the opposite as well, no(too many nutes/hot soil)?
Generally when we look at a plant that is being over watered and/or underfed, we would see the leaves drooping and curled under looking sad and depressed.
generally i would agree with you except it looked like straight peat in that pot, and i wasn't reffering to overwatering really, but complete saturation, wich i recently had issues with this past winter, seems to only affect seedlings, grown in mediums like pure peat (jiffy pellets for me) that are capable of becoming so saturated with water that the roots are starved for oxegen. my plants never got the standard droopy leaves from it that you see when you overwater a more established plant.
i'm not saying i'm right, i'm just guessing based on the fact that the plant seems so young and that it's grown in what looks like straight peat moss. since no fertilizers were mentioned i am assuming he hasn't used any yet.
also nute burn is almost never a nice even color change like pictured above, it's characterized usually by patches of necrotic tissue and yellowing blotchy and burned, not an even yellowing...