You did confuse them, but there is still uncertainty as to what your water's alkalinity actually is.
As I mention, Temporary Hardness is USUALLY equivalent to the alkalinity. But a water source could have high alkalinity and low hardness. Witness a case where you add sodium bicarbonate to distilled water. That water has zero hardness, but it certainly has alkalinity from the added bicarbonate. Some water sources could be similar to this. Thus, its not always true that Temporary Hardness is equivalent to Alkalinity.