Judging from the photos, he does not understand the key points of calligraphy, let alone be called a master.
To read calligraphy, you need to look at lines, strokes, glyphs and compositions. Of course, it is too tiring to look at them carefully. Let’s talk about lines first. Calligraphy requires the center of the pen to be used, and the lines to be written should be round and strong, but from the top view, this is not achieved. But it seems to be powerful. It is the effect of momentum, but it is just taking advantage of momentum, or playing nonsense.
As for the strokes and glyphs, the four works look like wild ways at first glance. There is no ancient method without learning from the ancients.
As for the rules and regulations, maybe the rules and regulations are arranged properly but there is no change. If you look closely, you will see that they are actually very average. Like the signature, Xin, Nian, Zui and Cao all take the long form, which is really a big problem.
Here is a pair of Yan Zhenqing’s calligraphy for comparison.
Furthermore, I think the valuation you mentioned is worthless. As for me, just look at it, smile and leave.
Just briefly, I hope it will be helpful to you. Personal words, please comment if you don't like it.