No way. This is how young player signings work in the modern game. Red Bull Salzburg signed Naby Keita for 1.5 million on the back of 23 appearances in Ligue 2. RB Leipzig sold him for 60 million four years later.
Now if you wanna argue they should've seen more than 13 games from him, I'll agree with you.
Not every signing will hit (this isn't a judgment on Jorgensen; none of us have seen enough of him to decide one way or the other), but they don't all have to in order for the exercise to be worthwhile.