After all, true history and a historical chronicle are different things. In principle, it's possible, but please keep in mind that everything said is based on textbooks and chronicles, which may not necessarily be true.
"Regarding the Veles Book, I would argue. The material is too dubious."
And that's true. The materials that are widely known somehow contradict what was actually written there. I'm not a historian, so my view may be superficial.