Thanks for all the replies.

I agree that in the absolute sense of the word, no one with cancer is ever "cured": the word is used loosely for NED (no evidence of disease) after ~5 years, with low statistical likelihood of recurrence, and among themselves, oncologists prefer terms like "long-term remission" (without the need for meds) or "functional remission" (helped by meds, like in my case).

I'm just surprised that some oncologists think modern treatments for oligometastatic cancer might sometimes bring an outcome where they would be willing to use the (imprecise, unscientific) word "cure" with a patient, the way they do for early-stage PCa.