Ann: CLARITY 2.0 COVID-19 Study Concludes Recruitment, page-12

Maybe I'm reading too much into it, but I find this statement telling

they didn't see fit to continue recruiting past 49 patients and the remaining 30 would likely not change the result..

So if the first 49 patients had no benefit then it's unlikely 31 extras would see a benefit

conversely, if the first 49 patients all saw a benefit then it's unlikely 31 extras wouldn't see a benefit

Both scenarios are possible. But it seems more likely to me to be the first scenario for them to stop recruiting. Because if the second scenario was true, surely it would be better to keep recruiting to have that knockout headline: "100% 80/80 patients showed a benefit" right? Why stop at 49?