Well, you initial issue was about Manjaro Hello, and i did agree with your observations, hence i opened an issue with what i thought would be fit to solve the Manjaro hello description font issue …
What you present now is simply put, Linux font rendering problem … To be honest, all screenshots you shared (from Windows or Linux) all look blurred on my end, so is hard to get to a conclusion.
We could start by investigating it. Share:
inxi -Fazy
Or share it according to this fine [HowTo] Request support