From what I've seen of clarinets, saxophones and bassoons, I would agree with the paper. However, as a pathetic flute player, I have experienced (upon many different occasions) just how much difference a sterling head joint can make.
Taken up as a head joint only, with my eyes closed, in groups of several such beasts, the solid silver one always (without exception, over many, many trials) sounds quickly and more vibrantly over the silver plated ones or the (shudder) nickel plated ones. When mounted on my cheap-o horn - er - tin stick, it actually makes me sound like a flute player.
As Nora Jones says all too often, "Don't Know Why". But, at least for me, it makes a difference.