Earlier quoted context omitted.
> When I was a child, the conspiracy theory among kids was that Coca-Cola inserted subliminal ads by interlacing a can of Coke within TV series or movies. I cannot believe reality surpasses all those fantasies. Reader: Yeah, that happened... Narrator: It did: https://www.businessinsider.com/subliminal-ads-2011-5
No, the idea that you can insert a single frame into standard video formats and have it subliminally influence you is an urban legend. You can try it with any video editing software. A single frame at 30 or 60 fps is extremely visible. It's not passing by your conscious awareness undetected. The flash is obvious and you can easily read a word of text or recognize a logo or someone's face.
Compare "vampires walk among us" versus "Theranos works".
It did happen, and it didn't work, are not mutually exclusive.
Theranos happened, and subliminal advertising happened.