> one can't help but noticed Xi's much more conciliatory tone in the past few month
It maybe more relates to the fact that diplomas advocating for a more hawkish foreign policy being slowly wiped out from the power centre after mid 2021. Though a full swing policy change may only possible after the first plenary session of the 20th Central Committee (which was October 2022).
Xi never hides that he is just reading what was decided within the party for many of these foreign policies. SCMP has reported that during the Xi-Biden meeting for any issue not directly related to China, he will read the notes.