A pdf looking at Meroitic. Saving everyone a long read, the conclusion is….
This paper has contributed to this line of research by specifically outlining that there is no strong evidence against Meroitic not being a member of Afroasiatic, and that on the contrary, the investigation into consonantal compatibility restrictions shows a strong possibility for its inclusion, as this phonological process is a distinctive trait amongst Afroasiatic languages. This paper does not make any claims as to the likeliest individual candidate for relatedness with Meroitic, but hopes to redirect this research with promising results.
So, Meroitic may well be Afro Asiatic.