The tweet mentions a WAF bypass or JavaScript sandbox escape that requires deep knowledge of JavaScript and HTML. These examples are not typically used in bug bounty hunting. The bypass is applicable to a wide range of vulnerabilities and WAFs. It showcases the importance of understanding the intricacies of JavaScript and HTML in bypassing security mechanisms.
For more details, check out the original tweet here: https://twitter.com/garethheyes/status/1922014196570484971