Do you disagree? Would it help for me to show you the probability is strictly non-zero?
Sarcasm. "Probably one of the most" is quite a few weasel words for somebody universally included in any list of significant physicists.
One of how many? "One of the three most talented" would be a bold statement, "one of the 300 most talented" would be an understatement. (Edit: now it occurs to me that you might find that opening sentence an understatement?)
You missed my sarcasm. I did indeed think it was quite an understatement / poor writing to be so afraid to say "one of the best physicists of the 20th century".