In way two things can both be true - this paper says there are both cognitive differences between the sexes that seem to affect reading and referal bias with dsylexia and boys.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5438271/
It is now clear that we can divide the over-representation of males with dyslexia into two parts: one invalid part explained by referral bias, and one potentially valid residual part found in epidemiological samples (Rutter et al., 2004; Shaywitz, Shaywitz, Fletcher, & Escobar, 1990). The male : female sex ratio in referred samples ranges from about 3:1 to 5:1, whereas the sex ratio in epidemiological samples ranges from 1.5:1 to 3.3:1 (Rutter et al., 2004; Shaywitz et al., 1990), depending in part on the criteria for severity of the reading deficit and minimum-IQ for a diagnosis of dyslexia (Olson, 2002; Quinn & Wagner, 2015).
I found the paper interesting as it links common morbidty of ADHD with dsylexia - both are issue in my family though girls frequently harder to diagonse with ADHD as presnetation differs.
My issue isn't that boys struggle - I accept more boys are at lower end of attainment - it's more but that get's muddled to a more general message of boys struggle with reading or boys don't read - delaying interventions or so engained that it's trotted out about a boy who clearly was reading. The bias becomes enforced an accepted as "truth" so rather than early support to help the back end of boys the lack of progress gets entrenched and becomes a self fulfilling prophecy.
All my DC verbal skills were developed early and were very good and had plenty of practice with social skills - they still struggled with reading - there seems to be a mix of hearing issues - partly not hearing sounds clearly and another issue of correcting words written and spoken to their expectations - it's most visble in dialect words form wider family which they just automatically correct to something that makes sense to them.
I've not has any real problems finding books for DS vs my DDs so while I've often seen that touted as a reasons it wasn't an issue for us.