This is a rather bold claim given that the most obvious influence was the method syntax of Oberon-2 (designed by H.P. Mössenböck, the PhD supervisor of R. Gries

This is a rather bold claim given that the most obvious influence was the method syntax of Oberon-2 (designed by H.P. Mössenböck, the PhD supervisor of R. Griesemer), and besides that there are only some superficial similarities between Oberon and Go. See https://news.ycombinator.com/item?id=32303837 https://news.ycombinator.com/item?id=32303837.