@Shashank i am reading what he wrote, and indeed your understanding of what he is referring to by using the adjectives “vast and utter” makes sense.
It doesn’t take much thought to realise that an infinite and eternal universe is at rest in relation to itself. Which means, at every single point, it is also “vast and utterly still”.
Richard used this definition repeatedly, so I doubt it is something he was flippant about, considering it is central to the entire discovery.
I would concede being wrong on many other quotes, as he was also writing extemporaneously. Except on this one. If he had meant something else, why would he use the exact same words repeatedly over many years?
That would not be extemporaneous, but deliberate and consistent. That is, words he was happy with describing the central driver of Actual freedom.