Patients with prolonged ICU admissions on immunosuppressants have always been susceptible to fungal infections (more frequently aspergillus or Candida, rather than mucormycosis that the article refers to). The management of severe covid includes immunosuppressive drugs such as dexamethasone and tociluzumab which whilst improving covid outcomes makes patients more susceptible to other serious infections. So covid ICU patients may well be on antifungal drugs too.