Okay, I watched the video and that cookie was bound to be awful.

• the chocolate was 100% dark, you need to add sugar and/or milk. Most chocolate chips are semi sweet.
• was that flour even baking flour?
• something was definitely off with that egg, there was no adhesion.
• he mismeasured like 4 things due to spillage not tared out. Probably no real difference.
• I’m suspicious the vanilla extract was done correctly.
• his mixing sucked
• an oil based cookie is going to have less flavour than butter based.
• the actual cook was done wrong because he removed it from the oven. The stuff he saw on the top was likely due to bad mixing, the cracks due to flour. When he removed it and put it back in the vacuum oven it would have just suctioned the cookie outwards instead of rising inside.

Plus, there was no control cookie from grandma.