Still waiting on the full video but James O'Keefe has some clips on his Twitter
https://www.twitter.com/JamesOKeefeIII/status/1326337154050641920
https://mobile.twitter.com/JamesOKeefeIII/status/1326323334800437248
Retweeted by the GEOTUS himself https://www.twitter.com/realDonaldTrump/status/1326347841476890627
Edit: And here's the full 2 hour audio
While I don't know that it's a stress tactic to implant a memory, it's absolutely a stress tactic to undermine his memory.
I have a lot of experience in the topic of psychological manipulation and social propaganda.
What the guy here is doing is basically a refined version of an old mafia tactic when you want somebody to shut their mouth but can't afford to be obvious about it.
He's not-so-subtly giving his mark a way out while very obviously trying to convince him that what he did was wrong. The idea is that you put yourself in a position of authority over the other person, slowly feed them and ramp up the idea that they made a mistake, then offer to help "correct" it. Otherwise, they might meet some misfortune.
By abusing certain aspects of human psychology you can get most people to play along with the scenario.
Think of it as the upscale version of, "Oh what nice windows/kneecaps ya get there, be an awful shame something were to happen to em? Why don't ya help me out so I can help you out."
I was going to say that this is something you could see in a lot of interrogation videos. I wouldn't call it planting a memory, but they certainly are driving the conversation in a specific direction to get him to speak against his own claim, or get him to agree to the invalidity of his own claim... using all the same tactics you speak of.