Is the work appraised by calligraphy appraiser Shan Jiong authoritative?

Don't say that the works appraised by Shan Jitong are not necessarily authoritative, even the so-called appraisal certificates issued by members of National Cultural Heritage Administration Painting and Calligraphy Appraisal Group, Yang, Xie, Dan Guoqiang, Shi Shuqing, etc. are not necessarily authoritative, and they have no legal authority.