Here's another question I came across.
Can I say my site is fully accessible in the accessibility statement?
The short answer is no.
Just because you got 100 in Lighthouse doesn't mean your website is fully accessible. I can't even fathom what fully accessible means. There's no zero to hero scale for accessibility. Accessibility is subjective, device-dependent and constantly shifting because standards evolve. Browsers evolve. Assistive technologies evolve.
"Fully accessible" sets a bar that you can't reliably clear. Not even organisations with large, dedicated teams make this claim. Chances are that's not you anyway.
Making that claim would probably land you in trouble as well. What if your fully accessible site turns out to not be as accessible as you thought for someone? They might be inclined to use your words used against you.
You win more points if you're honest about what you've done, what you have left and what you're doing about it. Name the standard you're working towards. Explain how you've tested your site. Flag any known issues. And tell users how to report problems or get help.
That kind of transparency builds more trust than a sweeping claim ever would. People have seen enough empty promises to know the difference.