The tweet mentions working on a WAF bypass video using proxychains. Proxychains is a tool used for proxying connections through different proxies. The tweet lacks specific details about the vulnerability type and WAF vendor. It would be helpful to provide more information in the future to better understand the context of the bypass.
For more details, check out the original tweet here: https://twitter.com/coffinxp7/status/1912143440806130105