Would accessibility scanner such as “Allyable” identify the Accessibility Overlay modifications to the site showing that the site is now more accessible?

Would accessibility scanner such as “Allyable” identify the Accessibility Overlay modifications to the site showing that the site is now more accessible?

Yes. Allyable accessibility is applied as a virtual layer on top of the website code, meaning once the website is loaded the accessibility modifications are already applied.
Other tools will rank it higher as well as google SEO ranking