The article doesn’t really get into it, but the paper they linked to goes into further detail to answer your question.
The patient received 2 days of ivermectin (200 µg/kg/d) and 4 weeks of albendazole (400 mg 2×/d). She was given a weaning course of dexamethasone (starting 4 mg 2×/d) over 10 weeks, while all other immunosuppression was discontinued. Six months after surgery (3 months after ceasing dexamethasone), the patient’s PBEC remained normal. Neuropsychiatric symptoms had improved but persisted.
The article doesn’t really get into it, but the paper they linked to goes into further detail to answer your question.
https://wwwnc.cdc.gov/eid/article/29/9/23-0351_article