If you don't mind my adding: IMO, that video interview was not arms-length and should be considered with that in mind.
The interviewer revealed that she is distantly related to Lafitte (common great-great grandparents or the like, and she has seen and talked to him at large family reunions). She also represents at the beginning that she is a former-reporter turned private journalist, so is acting on her own with this interview. IMO, her questioning is generally supportive and non-challenging, even to the point of describing how Lafitte's behavior in certain circumstances was common business practice among professionals (rather than leaving him to describe it that way).
So, it's a bit like Lafitte simply recording himself saying all that was said in the interview, with the interviewer perhaps adding a bit of professional polish that was generally helpful (toward him).
ETA: For example, an objective journalist would not have allowed Lafitte to get away with so easily explaining away the loans Lafitte extended to AM out of the Plyler girls' accounts. (He explained this practice by saying they earned more on those funds than they'd earn had the funds been left sitting in the account and the interviewer did not challenge him on that claim.).
However, as a fiduciary, his role is to protect those funds and responsibly invest and administer them. So, even though the 1.5% in interest charged on those loans was more than the 0.25%, 0.5% or 0.75% that Lafitte said they'd earn sitting in accounts, that 1.5% was likely far less than an arms-length transaction would be for such a loan. AM was paying "below market" as that rate was not reflective of risk and that is taking advantage. Lafitte was violating his fiduciary responsibilities in making those funds available for AM's use.
The interviewer asked whether he took loans from both girls' accounts and he said he only did from HP's and not from the other sister (AP). The interviewer doesn't ask why or explain to those viewing the video that HP was the younger of the two sisters. It seems reasonable to me to assume that the younger sister's account was thus pillaged because Lafitte and AM would have more time before she turned 18 to replenish the accounts and more time before HP would become wise enough to question the administration of them. A responsible journalist would have asked such questions.