Are all Liu Wenxi's calligraphy works true?

His calligraphy works are definitely hard to distinguish between true and false in the market, but according to friends, Liu Wenxi's calligraphy works in Andefengtang Gallery are all true, because Lu and Liu Wenxi, the owners of Defengtang Gallery, have been close friends for many years, and the boss himself has a unique ability to identify calligraphy, so Liu Wenxi's works in Defengtang Gallery are all true.