Speculation about which type of approach they were flying...... and how this precipitated the crash is pretty immaterial and will not lead to the 'why'.
Despite this aircraft being flown by two capable guys who were both visual with the field from 500' down to the runway they crashed hard at a steep crossing angle to the centreline. That strongly suggests that the aircraft was not under control when it hit the runway - This is where the focus of the investigation will lie.