This is the 1593rd most frequent Dutch word.
hijzelf
"Hijzelf" means "he himself" in English.
The word 'hijzelf' is used to emphasize that he, personally, was responsible for completing the project, distinguishing his action from others.
Hijzelf heeft het project voltooid.
He himself completed the project.
Here, 'hijzelf' contrasts the action of giving the presentation with another action, emphasizing that though he performed one task, he abstained from another.
De directeur gaf de presentatie, maar hijzelf beantwoordde geen vragen.
The director gave the presentation, but he himself did not answer any questions.
In this situation, 'hijzelf' highlights the personal involvement of the individual in accepting the offer, which might be notable or unexpected.