In all fairness, it never says that the statement about Michael Green was made by Steinway & Co. or someone representing it in any way. True, most of us, me included, first thought of the piano makers, but it could have been anyone with last name Steinway. It may be misleading because of our views, but it may really be true. Regardless of what it is, it deserves benefit of the doubt that it was some Steinway man who said it.
The part about Ray Charles, Beatles, etc. is mentioned often on this thread. Where exactly is it on the website? I tried to find it, but could not. What I learned about myself here is that I have a hard time finding things on Michael Green associated websites. Even when many others saw it, I cannot find it. That does not include tuning description/instructions from start to finish. I am starting to believe it is not me, but the website design.
However, it would take only one project in one studio that is used for mixing/mastering/anything of recordings by said artists and a person could say that her/his work was used for recordings of those artists. Many, if not all, of those mentioned musicians have had their recordings worked on in some way relatively recently, including after their deaths. If Michael Green did contribute to such an establishment, he could truthfully say he was involved. Maybe not sitting there during recording sessions of Yesterday or Hey Jude, but there would be some involvement. Think about Bob Ludwig’s studio. Many well-known artists’ recordings have been worked on there. Whoever supplied monitors can say she/he was involved in the process and these are the names who used it.