I did look at your sources. They describe lower bioavailability and nutrient density, and have advisements for supplementation and a diverse diet. Low density and bioavailability does not mean non-existent. Low bioavailability does not mean not at all bioavailable. Can you point to a specific line that says it is impossible to obtain a nutrient in sufficient quantities on a vegan diet, even with supplementation? The third link seems to be the most related to your point, but I don’t think it says what you’re arguing, from what I can see. I’m sorry to say that the links are long and I going to need you to point me to lines that support your thesis.

Edit: Hopefully you read this after this edit, if not can address as a followup. Here is a page on the NHS specifically referencing how all nutrients can be obtained on a vegan diet: https://www.nhs.uk/live-well/eat-well/how-to-eat-a-balanced-....