It is a valid line of inquiry if you consider that not taking care of basic personal hygiene is a symptom of mental incompetence. We do not want to elect a mentally incompetent leader. By all visible evidence, the man has working arms and hands that should presumably be able to reach to wash himself. So if he goes around smelling like a toilet dumpster then something is mentally wrong there.
Of course there have been numerous other indications of such issues beyond the reports of stench.
I think one of his worst pieces of advice is to pay off debts before saving for an emergency fund (if I remember correctly)
Saving some kind of emergency fund first is more important than not having any debts. Having money on hand is worldly power in your hand basically. If you’re debt free but broke, then you can’t deal with an emergency that requires money.