Do promises only apply to first team matches?

[SuperFulhamFC]

I recently signed a promising Full Back for my U18s, and as part of the contract negotiations he wanted me to promise to play him as a Defender (Left) with the role of Wing Back. This was agreed to since it's exactly where and how I want him to play. Anyway, in the promises screen I now see the following:

I checked the promise by hovering over it, just to double-check I'd not missed something:

So I can't for the life of me figure out what his issue is:

Unless, even though he was signed on a youth contract the promise infers he'll get first team games in that position and role?

[lemeuresnew]

yeah, it is for 1st team games. he obviously wouldnt be upset otherwise