A-level PE Revision 2018 - Stress and Stress Management

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Hiya, at 12:20 (ish) you talk about the hypothalamus stimulating the production of adrenaline. However, I was taught in biology that the adrenal medulla of the adrenal glands produced the neurotransmitter and this production was stimulated by the sympathetic nervous system; and was not controlled via the endocrine system / hypothalamus (unlike the adrenal cortex which is stimulated by ACTH from the pituitary gland which is stimulated by CRH from the hypothalamus.)
Would you be able to clarify this for me? Does the hypothalamus actually stimulate the adrenal medulla and how would it do this? Also, wouldn't that be an inefficient way of releasing adrenaline due to the time it would take for whatever hormone it would secrete to act upon the medulla?