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Argument 1
Argument 2
Does the vegan diet have a high risk of Vitamin B12 deficiency?
It seems that way, but it is not fully known and supplementation is recommended.
No, you can obtain B12 more optimally from a vegan diet.
Source 1 Article via 13 authors via the National Center for Biotechnology Information

B12 deficiency has been observed among all forms of vegetarian diets and so supplementation is recommended. However, studies on the use of plant foods to increase the Cbl (B12) intake are promising, but still require more data. Some seaweed, mushrooms and fermented foods can be a useful source of Cbl, but the data are still insufficient and production is too heterogeneous. More trials with vegetarian people using supplements or fortified foods are needed to better explain the efficacy of different strategies of cobalamin (B12) uptake, focusing on the best dosages, media or foods, if reliable. 
Article via Nutritional Therapist Joe Jackson via

Many foods such as non-dairy milks, cereals, spreads, and nutritional yeast flakes available in a plant based diet are naturally fortified with B12. Fortified vegan-friendly B12 is not bound to protein, therefore it has a greater bio-availability (increased and easier rate of absorption through the gut lining). This readily digestible form of B12 does not require your digestive system to work as vigorously, and therefore may help increase absorption rates dramatically where digestion may otherwise be compromised.
Four stars

Peer reviewed science or well-sourced and mostly unbiased research document.
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No known bias.
Well sourced
Peer reviewed researched

Two stars

Known bias, does not take into account full picture, limited sourcing.
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Known bias, as website “veganlifemag” advocates for the vegan diet.
No sources are provided.
The quoted author’s credibility/expertise could not be verified (Nutritional Therapist Joe Jackson).

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