"... no cases of severe COVID‑19 were reported in the Moderna COVID‑19 Vaccine group compared with 30 cases reported in the placebo group."
0 is miniscule, 30 isn't.
I don’t know how many were enrolled in that particular trial, but if it is close to the 30,000 that I have read about then 30 is pretty miniscule. Of course a lot more information needs to be looked at but on the surface you could argue that 30 out of 15,000 is just statistical noise.
Pfizer found 9 out of 21,500 severes. Minuscule.