I agree with the instructor. We all had to learn once and were hopeless right at the beginning. It doesn't hurt to wait for a few seconds while the learner makes his manoeuvre.
I don't see what else the driver could have done in all honesty, maybe hand the back of the van out of a space and be a hazard - I would suggest if posting things like this then it's good practice to make a recommendation on what you would have done, and how you would have parked.
Otherwise it's just a silly post for the sake of posting something.
I agree with the instructor. We all had to learn once and were hopeless right at the beginning. It doesn't hurt to wait for a few seconds while the learner makes his manoeuvre.