It'd be nice if they'd tell you about the evidence, wouldn't it? That they won't is kind of incriminating. There's no doubt the Bezae Codex has been in regular Christian use since around 400 A.D., and often cited by clerics regarded as "official" when its readings were seen as helpful. I was just reading an article discussing its history as a physical object. https://www.ancientjewreview.com/articles/2019/5/19/the-plunders-of-codex-bezae