Hello, looking at your save file this doesn't appear to be an issue.
The vision wants players signed for the first team i.e. squad player or higher.
Of the 3 signings, Van den Berg is a 'fringe player' (not a first team player) so he doesn't qualify.
Nascimento has been loaned back out, so can't play for first team.
So only Essugo counts, and he has started 1 CL game and come off bench in 4 league games.
That is why the board is disappointed.