Nope....that was a Brit from BAH that said that.
Odd...I don't recall the Chinook to be anything but smooth but then we had hundreds of the things and lots of very experienced maintainers working on them. Perhaps our corporate knowledge gave us an advantage.
Mind you when the forward swash plate got a bit of wear....usually right up there within just a very few hours before TBO....they could get a bit lumpy with the Thrust Lever (Collective to the unwashed) down near the floor. One felt like saying something along the lines of "Whoopee Ti Ri Yo!" when experiencing that ride. If you got out of synch with the vertical....you did get a butt beating!