Very strange for Shah Waliullah to have said all these things that you have mentioned. His greatest contribution to Islam was his courage to translate the Quran into Persian. For this he had to face the wrath of a great many people. . His son translated the Quran in Urdu.
It is very difficult to verify the authenticity of what is written in a book and its true authorship. Many a times righteous persons have been wronged for things they they never did or said.
At the moment Ghamdi is respected among those who are educated and Quran oriented . I do not agree with all his ideas, but much of what he says is close to Quranic injunctions.
I know for sure that he does not believe in Hadith literature, but at times it becomes imperative to show respect for something that the majority believes to be true. Let me give you an example. Most of the times what I say in my discussions and lectures is heavily inspired by the writings and teachings of Perwez Sahab and Dr. Shabbir. Everyone is highly impressed and show their willingness to accept the logical Quranic ideas, but the moment one mentions Perwez Sahab's name they start avoiding and rejecting your contentions.