XINGYHENG 8A DC-DC High-Power Buck Boost Converter Module Adjustable Voltage Regulator DC5-30V to 1.25-30V Power Supply Module with Short Circuit Protection

Charging at 12v 3amp, it is all wired according to the diagram on page 3. Would this be deemed "an actual battery charger"? And if so would I still use the BMS with the charger?