Update from Trump's medical team say they have decided to initiate dexamethasone.
According to NICE guidelines it should be used only for severely ill patients and may be harmful to those with a mild form of the disease.
Offer dexamethasone or hydrocortisone to people with
severe or critical COVID-19 (in line with updated WHO
guidance); that is, people with any of the following:
• acute respiratory distress syndrome (ARDS)
• sepsis or septic shock
• other conditions that would normally need life-sustaining
therapies such as ventilation or vasopressor therapy
• signs of severe respiratory distress
• oxygen saturation 30 breaths per minute in
adults and children over 5 years)
Corticosteroids should not normally be used in people
with COVID-19 that is not severe or critical, because there is
the possibility of harm to such people
So either he is very ill, or they're lying about the dex or they're incompetent or trying to kill him