Not sure about that. I have a lot of knowledge about it. It is regarded as one of the most treatable and least damaging chemos out there. If it is aggressive, that sounds bad, but it's actually good. It's a blood cancer so it is very susceptible to the chemo. Anywhere it is, it is struck. Results are usually great even after the first scans. These are often even cured.
Now if it is indolent and slow growing. These type are even treatable in stage 4. They usually aren't "cured" but they do go away for years at a time. They are slow growing so generally the chemo isn't quite as good at keeping them permanently away. They can even take the watch an wait approach. I heard an oncologist say "indolent lymphoma is more like a disease you live your life with, like high blood pressure."
In this case it sounds aggressive. The outcome also determines on the shape the patient is in. Which is great in this case. It's a bumpy road, but compared to other cancers it is definitely doable especially for someone in great shape.