It dosent matter...if air temperature is higher, thermoreceptors will detect this and transmit impulses to hypothalamus and set the negative feedback process into action...Confirmed..by the following source
BBC Bitesize.(England's Revision Source for GCSE exams)
The question was not about whether vasodilation occurs in that situation. Rather it asked whether it would contribute to heat loss by body, which in this case I think its contribution would be negligible because of the temperature difference between the skin and the air.