According to that link, it sounds like they are:
>Title III prohibits discrimination against people with disabilities by businesses open to the public (also referred to as “public accommodations” under the ADA). The ADA requires that businesses open to the public provide full and equal enjoyment of their goods, services, facilities, privileges, advantages, or accommodations to people with disabilities. [...]
>A website with inaccessible features can limit the ability of people with disabilities to access a public accommodation’s goods, services, and privileges available through that website—for example, a veterans’ service organization event registration form.
>For these reasons, the Department has consistently taken the position that the ADA’s requirements apply to all the goods, services, privileges, or activities offered by public accommodations, including those offered on the web.
The courts also found that Netflix was a public accomodation in 2015 as part of a lawsuit, and Netflix was forced to provide subtitles on 100% of their programming.