It is true. Dr.Güting really learned Coptic. Moses left Egypt (Exodus 12:37). Jesus entered Egypt and stayed there, until Herod was dead (Matthew 2:13-15). This was one of many preconditions for him to be the son of God (Hosea 11:1). Consequently, during the first centuries a strong Coptic church was established.
Thus Dr. Güting decided to learn Coptic to understand certain parts of the Bible much better.
Happy Easter and Peace on Earth!