definitely not trying to speak well of all popular science titles, just saying that this one seems perfectly acceptable :)

and yeah, that Oxford dictionary isn’t giving you the definition used in the scientific sense, so that’s your problem:

The term “confirmation” is used in epistemology and the philosophy of science whenever observational data and evidence “speak in favor of” or support scientific theories and everyday hypotheses. utm.edu

i checked Oxford Learner’s, and the meaning used in this context is number 2 just below what you found.

to make a position, an agreement, etc. more definite or official; to establish somebody/something clearly

language is confusing but this is definitely the scientific one the article means.