@o_holter , Fidelizer has nothing to do with DSD. It optimizes playback by shutting down unwanted services and daemons running in the background. There is something more that it might be doin. You can go to their website and lookup.
Like I said, Foobar2000 is not for everyone. I can set it up and configure it in under 30 minutes due to the sheer amount of time I have spent on understanding and setting it up on 2 previous laptops before I installed and set it up on my server. On Audiophilestyle.com website they have a thread on T+A DAC 200 and how to use HQPlayer with that DAC. It is far too complex than Foobar2000, but is supposed to provide the best possible DSD listening experience. Seems like you can convert even Tidal and Qobuz to DSD 512 or 1024. I am thinking of going that route, some years from now.