Case study 1:

It was, however, learned that he had consumed 8 to 10 cans of energy drinks per day (3.5–4 Lit/d) in the 2-week period leading to the hospital admission.

I don't think I even need to elaborate here.

Article 2:

The results found that 19.6% of the participants consumed more than 400 mg of caffeine every day, which translates to about four cups of coffee, 10 cans of soda or two energy drinks. Chronic caffeine consumption at 400 mg daily was shown to significantly impact the autonomic nervous system, raising the heart rate and blood pressure over time.

Common knowledge, 400mg per day is set as the "safe limit", the vast majority who go over this limit have no issues.

Case study 2:

Alcohol and illicit drug use were denied, however there was a history of regular ‘Energy drink’ drink consumption, specifically consuming an average of four 500 mL cans per day for approximately 2 years. Each can contains 160 mg of caffeine in addition to taurine and various other ingredients.

In other words, the kid was sus and probably not entirely truthful about what he was consuming and gave no specifics, also above the well-known "limit" of 400mg.