arris basically Tati just exposed all the shit he's been doing and how he's taken advantage of her.
Spilled that her husband and herself have negotiated better contracts for James, making him legit millions more than he was originally being offered before they stepped in. Talked about how he constantly was talking about sex and "turning" straight men (very graphic descriptions from James) at her birthday dinner in front of all her family and friends, including in front of his own parents at Tati's house. Called out the fact that James has only once promoted her company on his channel or Instagram, quoting that he "doesn't want to promote supplements and vitamins to his young audience for fear of controversy in promoting pills to young teens" but then did a sponsored post for her #1 competitor on Instagram, and never took down the sponsorship after she posted about how hurt she was by the post (citing that she's seen his contracts from negotiating them before, and called out a likely bullshit lie he used in his apology post of accepting no money from the post, but conveniently also never took it down, which is a common requirement of sponsored posts- they have to be left up for 24 hours if you want the money).
tl;dr she pretty much just called out every single thing people have been calling out James for since he became popular, and no longer wishes to be friends with him after how poorly he's treated herself and her husband after everything they've done for him. you honestly have to watch the full 40 minutes to understand it all.