"Because the October CPI release was canceled, Thursday’s report lacked several of the standard data points typically included in a CPI report. The Bureau of Labor Statistics said it could not go back and collect October survey data, though it relied on “nonsurvey data sources” to construct the index. As a result, economists may be cautious about interpreting the report as clear evidence that inflation is on a sustained downward path, given the absence of an October comparison."

...and there is the missing piece to the puzzle.