Earlier quoted context omitted.
No, you're right, but the fact that Stallman is 70, and "under chemo," and still giving talks would suggest that whatever chemo he's under is relatively easy on his body.
Most chemo nowadays will make you feel sick for a day or two, but they also usually give you something to manage the symptoms. If it had been a few days since his last dosage, he was probably feeling decent all other things considered. Radiation therapy, on the other hand, is still being burned alive from the inside out, and even opioids are insufficient most of the time. My dad tried to ration my mom's painkillers d…
When I did chemo, I had cycles with 5 days on - and I couldn't do anything useful during that week, or most of the next week. It was, truly, an awful experience. I completely understand and respect how some people can decide treatment isn't worth it and surrender to the disease.