^Your point 4 needs to be clarified.
We do not get vitB12 from animals because of supplements. Framers HAVE to supplement because of the farming practices that mens cows etc.. do not get what they need from their food. Wich is very different. If we were eating meat from cows who patrue raised, eating faisans or lamb, the vitamin B12 would not be coming from supplements.
The fact that vit B12 is found in the soil (Ill take your word for it), does NOT mean you can get it from plants. Animals are the only source of vit B12 (bar a few mushrooms if I remember well, NOT your button mushrooms you find in supermarkets).^
Snap shots of scientific information is just as dangerous as non scientific information imo
Apologies for being unclear - let me try and explain it better.
B12 is a bacteria. It is present in animals because in nature, animals eat food contaminated with the bacteria (primarily plants grown where there has been animal manure and untreated water). Animals also produce a small amount of b12 in their intestines (humans do this too, but it is not enough to meat our nutritional requirements).
Humans could theoretically get their b12 from eating plants grown in soil where b12 is present or consuming untreated water but we obviously don’t for several reasons (negative health consequences, we wash our vegetables, commercially grown veg is rarely grown in soil where b12 is present). Omnivores get b12 from animal products. The animals providing these products are themselves supplemented with b12 - for example, many cows are fed chicken manure in their feed because it contains b12.
A vegan needs to supplement with a b12 pill, or eat plenty of b12 fortified foods (like marmite / cereals / bread). But this is no different, in my opinion, to an omnivore eating animal products which have been supplemented with b12.
There’s nothing wrong with supplements - they are a great way to avoid nutritional deficiencies. And nutritionally, it doesn’t matter whether you take the supplement yourself, or eat an animal product from an animal who has taken the supplement.