اسْتَنْزِهُوا مِنَ الْبَوْلِ
Take care to avoid contamination by urine.
The cited narration connects a form of grave punishment with negligence concerning cleanliness after urination. It illustrates the religious seriousness of a practical duty that might otherwise be treated as minor.
The lesson is the importance of lawful purification, not a claim that this is the only possible cause of grave punishment or a basis for judging any named person's fate. Mentioning a cause and issuing a definite judgment about an individual remain different matters.