Taobao wasn't fully trustful to be honest, although that website is one of the biggest websites in mainland China. I prefer paying more attentions to those local concert promoters in China, like AEG Live (who booked Avenged Sevenfold for 2 shows in Beijing and Shanghai in Jan few months ago).
However, I saw some posts w/ some legal documents about the bookings of the shows, it seems quite reliable and things got confirmed or settled, I'd keep an eye on it. If you guys need translations for Chinese I can help a bit
P.S: Hope the band will schedule a proper Asia tour and also come back to Hong Kong!