I am almost recovered from slow-growing lymphoma myself. (not sure if the same subgroup, but both are B-cell lymphoma) I had my last doctor's appointment about it earlier today, in fact.

The problem is that it is chronic. It can reoccur. And it can mutate into malign lymphoma. But some people go twenty or more years without it reoccurring.

BTW. I got Covid-19 while having lymphoma. I recovered from that normally. But if I had also been under chemo, it would have been a different matter.