Reverted by https://www.openstreetmap.org/changeset/138564250 . According to wiki(https://wiki.openstreetmap.org/wiki/Zh-hans:%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%B0%91%E5%85%B1%E5%92%8C%E5%9B%BD#%E4%B9%A1%E7%BA%A7%E8%A1%8C%E6%94%BF%E5%8C%BA), subdistricts within the urban built-up area should use place=suburb.