cuisin=vegan should be avoided (https://wiki.openstreetmap.org/wiki/Key:cuisine#Discouraged_values), in fact this is now the only place tagged cuisine=vegan on all of OSM (https://overpass-turbo.eu/?w=%22cuisine%22%3D%22vegan%22+global&R). Could we use another value here?

(diet:vegan=only is sufficient to tag a vegan restaurant)