As
@staticV3 already wrote, the measured values don't change, regardless of whether they're coming through the RAW-HA1's analog input or the DAC.
How could it be otherwise? No matter how good the DAC in the RAW-HA1 is, it's completely limited by the Infinion amplifier circuit.
So if someone says the DAC in the RAW-HA1 is bad, they either have no idea what's going on, or they've disassembled the RAW-HA1 and taken a measurement inside the device, directly between the DAC output and the NJW1194 chip.
You can't upgrade anything with that device, since you can't access the DAC output, and a different DAC wouldn't change anything.
However, I personally wouldn't buy a RAW-HA1 either; the price/performance ratio of the SMSL Infinion amplifier isn't good enough for me in terms of the measured values.
For example, with an SU-1 or C100 and a Fosi V3 Stereo, PA5 II, 3E Audio A5se, A5, A7se, A7 etc. you get something cheaper and/or something with significantly better measured values.