In 1913, Howard Arnold Walter travelled to Kashmir and inquired about the tomb of Yuz Asaf. In 1914, he wrote “Islam in Kashmir” in the Moslem World magazine. The ROR of Nov-1915 reviews his article that appeared in the “Young Men of India”. The ROR of Dec-1915 has an article by him entitled, “Devotional Readings in the Quran”. He was also conducting research on Ahmadiyya in this era. From 1916-1918, H. A. Walter seems to have written this in-depth biography of the Ahmadiyya Movement, he was in Qadian and spoke to the Khalifa and was advised in terms of the beliefs of MGA. It was published in roughly Oct-Nov of 1918 (See the preface, which signs off at 10-10-1918, Walter died just 3 weeks later). This book was edited Farquhar, who had written about the Ahmadiyya Movement in 1914-1915 and was published.
In this book, he tells the world that while he was in Mohallah Khan Yar in the summer of 1913. He visited the tomb (and seems like he didn’t read the research work on Weitbrecht) and asked many questions. He says that Muslims told him that this house (gravesite) was in possession of the Hindu’s/Buddhist’s until Shia Islam came via Bulbul Shah. Walter then writes that this is the tomb that MGA said was miraculously revealed to him. Walter also explained how Hindu temples were being destroyed in Kashmir. In the 1990’s, Mirza Tahir Ahmad began casting doubt on the Yuz Asaf theory, and thus, by 2021, Ahmadi’s are calling it mere conjecture by MGA.