Amazing. I have been reading a page or so of Tibetan Book of Living and Dying every night. Here, too, they talk of pure awareness as being the meditation. Sogyal Rinpoche clarifies that resting in nowness or stillness is a great accomplishment, however he likens it to a glass of muddy water. If not stirred, the mud settles to the bottom. However, if at any time we stir it again, the mud will rise.
Thus, resting in nowness does not lead to liberation. Nowness becomes a subtle object, and the mind a subtle subject. So we remain in subject-object duality. As one's onepointedness in Calm Abiding increases, obscurations are removed and one can move into the openness that is the "wisdom that realizes egolessness". This is what will uproot delusion and liberate you from samsara.
This is on p75-76. I am only quoting from memory.