Is it still an achievement that the postgraduate patent of China Metrology University is revoked?

Not exactly. Withdrawing a patent means that the patent is not established and will not bring glory to schools and individuals, so it can't be counted as achievements, and graduate students of Ji Liang University in China are no exception. A patent is a patent granted and protected by law after the patent office has examined the invention and found that it meets the conditions stipulated in the patent law.