So you are saying the "Temperature" column here is coming from a circuit on the die, not an LM75 component on the board?
It is not either an LM75 ic
OR a circuit on the die because it is
BOTH of those things. The LM75A (if that's what's installed) is "a temperature-to-digital converter using an
on-chip band gap temperature sensor"
"On-chip" in this sense generally implies the sensor is included in the IC package, not that it's reading an external sensor (read: on the SHA256 ASIC Die).
Further, the datasheet doesn't show any inputs for an external sensor. Thus, it is likely that it is reading the PCB/ambient around the place where it's mounted, not the ASIC chips core temperature.