What was Biden hinting at with these posts on X in late June???

https://x.com/JoeBiden/status/1805399804907839898

https://x.com/JoeBiden/status/1805352725695144410

https://x.com/JoeBiden/status/1805002919017639950

I also remember #DeadJoe commenting that he had "something coming" for Trump. Can't find the video of it yet - was either in week before or after debate.