In my mind, there's nothing to "overthink". It is highly overpriced for the performance level and seems to not get some of the basics correct. That line frequency bleeding through should absolutely not be there in an "end game" DAC. No fuzz on that. I don't care how it "sounds". The engineer in me will not get past that.
It should not be there. On the other hand it is at -116dB, unless you're listening your music at the threshold of pain on regular basis that mains noise won't be audible, and even if you do it won't be audible either as your hearing is likely already damaged.