This guy does/did claim sola scripture, scripture alone - explained properly by his interpretation as revealed by “god”/himself.
Ahn, who like most Christians believed in the Second Coming of Jesus, and had predicted that the signs indicating the Second Coming had occurred would be revealed “within 10 years” in 1956. Ahn further believed to be living in the end time and that the Second Coming was imminent. Ahn through biblical exegesis in his book The Mystery of God and the Spring of the Water of Life (1980) (Melchizedek Publishing Co., Ltd.) interprets the Gospel of Matthew chapter 24 verse 32-34 to suggest that signs revealing the end world would begin 40 years after the independence of the modern state of Israel. World Mission Society Church of God in their later editions of the book have edited information pertaining to the prediction in order to clarify the authors intent. Ahn continued to prophesy about the years after 1988 in his book The Bridegroom Was a Long Time in Coming, and They All Became Drowsy and Fell Asleep (1980) in a discussion based on scriptural typology, presented his conclusion that in the context of working to complete the spiritual temple, the last day of the temple work would occur in 2012, an event which precedes other last day events detailed in his other books.