For me the dark mode is not more readable than the light mode.
I will explain why.
For me to see better it is preferrable to have more light.
The pupil of my eye wil be smaller and the vison for me is less blurry when the pupil is smaller.
Nice to know:
In the old days we had screens with dark backgrounds. Later the terminals and PC’s where introduced with light backgrounds. Selling point then was, “it is better readable.” The we already we had already older people which confirmed this.