Looks it tries to identify Apple devices and goes to Pixel for everything else.

            const platform = navigator.platform || '';
            const userAgent = navigator.userAgent || '';
            const isAppleDevice = /iPhone|iPad|MacIntel/.test(platform) || 
                                /iPhone|iPad|Mac OS/.test(userAgent);
            
            // Set redirect URL and message based on device
            const redirectUrl = isAppleDevice 
                ? 'https://www.apple.com/watch'
                : 'https://store.google.com/product/pixel_watch_3?hl=en-US';

Edit: per erohead, that change was made after your comment.