Column to detect if a date is in the last completed week relatively to today

IslastCompleteWeek.txt

IslastCompleteWeek =
IF (
    WEEKNUM (
        'Calendar'[Date],
        2
    ) = IF (
            WEEKNUM (
                TODAY (),
                2
            ) = 1,
            WEEKNUM (
                DATE ( YEAR (
                    (
                        TODAY ()
                    )
                ) - 1, 12, 31 ),
                2
            ),
            WEEKNUM (
                TODAY (),
                2
            ) - 1
        ) -- Is last complete week
        && 'Calendar'[Year] = YEAR (
                (
                    TODAY ()
                )
            ),
    -- Current Year
    TRUE (),
    FALSE ()
)