People saying that "evolution is a fact" is shorthand for "the evidence for evolution is so enormous that it can treated as a fact". The overwhelming majority of biologists have been so convinced by the evidence for evolution that they treat it as a fact. Textbooks tend to treat evolution as a fact. Evolution will not be treated as a fact in science as soon as we find the proverbial Precambrian rabbitYou can play around with word meanings if you like, but whether you call something proven to be fact, theory or not, evolution still is not a fact.
ETA: A relatively easy to understand bit of evidence for evolution.
There are things called endogenous retroviruses (ERV) which are viruses that insert themselves at random in the DNA of somatic cells and much more rarely germline cells. This means that a child will have the same ERV in the same locations as its parents with the very rare addition of a new ERV.
Human beings and apes share a number of ERV. Thus we share a common ancestor who had those ERV. The number of ERV we share with various apes agrees with independent measurements of our family tree, e.g. we share more ERV with chimpanzees than gorillas so our common ancestor with chimpanzees is closer to us than our common ancestor with gorillas.
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