No fossil evidence, no biological evidence, and no credible scientific hypothesis supports the idea that any non-avian dinosaurs survived this extinction event.

The tepui summits, despite their isolation, are not large enough, do not have a food web rich enough, and have not been isolated for long enough to have sheltered a surviving population of large Mesozoic reptiles that would have left no trace in any scientific survey.

The “dinosaurs on tepuis” concept is fiction, and not even very plausible fiction from a biological perspective.

The real story of why tepui summits harbor unusual species is much more interesting — and much more scientifically coherent.