Correlation vs. causation.
A lot of things which impact “intelligence” can also have varying impacts on speech/articulation/communication skills. However it is important to note that the correlation isn’t strongly positive or negative (IE savant syndrome).
So while some disorders may have some common correlations with specific speech/articulation patterns they (usually) are not good diagnostic criteria and extremely broad generalizations like the one above are particularly bad.
I used to have that issue, the secret for me was that I needed to explicitly look for wide shoes (Xw as in 10.5w) my current shoes are going on 2 years now :D