Maybe someone is just pointing out that your website is inaccessible.
For what it is worth, the Americans with Disabilities Act does not attract "bottom feeding law firms." It provides no monetary damages. It provides no attorney's fees. It only provides injunctive relief (and mediation). In other words all of the costs under ADA are borne by the plaintiff except for what the defendant chooses to spend on their defense. Thus lawsuits under the Americans with Disabilities Act are rare.
The lawsuits about which one reads outrageous reports are inevitably filed under state law and typically California's statute which does provide for attorney fees and damages. A few other states have similar laws, but in most of the country ADA compliance is spotty...and on the web it is pretty much the exception.
If it really matters, hire an attorney familiar with the case. If it sorta' matters read the law yourself. If it doesn't matter, it doesn't matter.
Sounds suspect to me, very vague, looks like it's looking for referrals to sign people up for some service.
official stuff would be from ada.gov, or some more popular, well documented site, not some one-off.
The wording could be some propaganda site, heh, with phrases like:
- We identify highly accessible websites with vital information. - We reach out to webmasters to notify them of an opportunity. - We offer free resources to webmasters who want to go accessible. - Most importantly, we do all our work with love. We Care.
ADA and accessibility sites actually provide much of the free info without having to contact anyone...
I had someone get a very similar email trying to get someone to change a link from me to a competitor. It sounds almost identical with a different domain. They linked to some accessibility checker. The problem, the site they tried to convince didn't pass this checker either. But the person who emailed wasn't concerned about that, they just wanted a link to me changed to my competitor (who was obviously their client).
If it's the same pattern, it's just a malicious negative SEO campaign. I'm planning on writing about it soon.