The phrase "indisputable truths" refers to statements or facts that are unquestionably true and cannot be argued or disputed by anyone. Full definition
The draft, in fact, is simply one more way of proving the lone indisputable truth of pro football life — a team is only as strong as its front office. (si.com)
The only indisputable truth was that his art existed within a diverse American context that encompassed illustrators like his father, N.C. Wyeth and Norman Rockwell, and also landscape painters like John Marin, Winslow Homer, Albert Bierstadt and Fitz Hugh Lane. (artmarketmonitor.com)
(Science does not produce indisputable truths; it produces robust consensus.) (dotearth.blogs.nytimes.com)