Yes, they do 'mention' the SES. But they carefully worked their statement in such a way, that it appears as if they were just the 'piano players', if you see what I mean. Like, for example:
"On the 22 March 1993 at 11 am Mr. Rudolf Gantenbrink discovered a small door at the end of the southern shaft inside the Great Pyramid. The discovery was made during a joint operation with the German Archaeological Institute."
"In 1998 Mr. Ian Lawton wrote the book Giza:The Truth. He had researched this book for several years. The book was published during his co-operation with Mr. Chris Ogilvie-Herald."