Technically, should be accepted... Though out of context, the first thought is really "her".
Ah. this is why we need native speakers. Encountering the sentence again, my first though now is "He needs that."
Some verbs require indirect objects (with preposition).
Precisar demands "de" before the object. (Unless the object is another sentence, with another verb).
English has some of those kind of verbs too, like "to listen". You don't "listen music", you "listen TO music".
It would be like "he needs she" ; "dela" can be divided in two words "de ela" - of her (presence).