I respectfully disagree, you are making several assumptions (all of us are) but the video is pulling out interesting connections and is not making a huge leap into speculation doing so. It is plausible/possible for an older person to use drugs and many do. I have personally treated a 78 year old using meth. I frequently see people using in their 60s.
Bipolar does not cause dilated pupils.
Sudafed is a horrible drug for allergies and does nothing to solve the underlying problem. Antihistamines and nasal steroids are 1st line treatment. Any doctor would tell him this.
So, why does he have boxes of sudafed? We are speculating. However, given the rash of celebrity and rich person drug abuse, it is certainly open for discussion.