You did not say you offered a surmise; you said "he died in peace." That is a flat assertion of fact, and you have no way to know, apparently. I just asked if there were any extant account; if not, then it is not known. I doubt there is any way anyone could have known anyway, even Valerie, if he was in a coma, had a brief moment of lucidity, and lapsed back.
By some accounts he had had a "terror of dying." Whether that changed because he was happy with Valerie is a question.
This is not simply about any one particular comment; it is about how any knowledge about Eliot--or anything really--is presented.
This list is not a very good microcosm of current (or past or future) literary concerns, but I doubt that many 'students of literature' care an awful lot about the minutiae of writers. Eliot's precise feelings were in the hour of his death couldn't throw much light on _either_ the poet _or_ the poetry. In fact, even as history of language, of more interest are the last words most frequently recorded on the "Black Box" in airplanes: "Oh Shit!"