This website is using a wordpress Full Site Editing (FSE) theme:
Recently wordpress has gone more towards FSE themes.

This means the layout, responsiveness, and structural behaviour is handled directly by WordPress, reducing the need for heavy custom code.
It will have some CSS and JavaScript effects making it less WCAG friendly but (Any limitations in WCAG are largely inherent to WordPress FSE itself rather than bespoke development)
This site will also feature:

• A shop
• A few blogs

Website: https://holmeswebsite.co.uk