in the exercise there's a word used "sûrement" as "probably",
however here it says it means "certainly":
and here seems to be meaning both:
Without the actual sentence, I cannot comment on the use of 'sûrement' without context.
I think you have answered your own question with your research, on the second page you quote, 'sûrement' is used to mean,
probably, surely and certainly
It all depends on the context.
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