Does the description of community help in the SEO (optimization) of the website?
Not really. Your content matters. But sure, there is small meaning. If I’m looking for let’s say forum of kayacking that should be founded some way in the name or description, not paddleforum and for floaters that never sink - if you understand what i mean 
But that is made because of users, not SEO.
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Okay thanks for clearing my thoughts up for this 