Evidently it's not the same, sorry; it seems that I lept to conclusions with the two signature mismatch vulns by ahacker1 showing up so close to one another but opening the very tiny, very dark, code picture shows this seems to be xpath-centric, not nodeType as the workos link discussed
Also using comments to bypass saml is very old news. https://duo.com/blog/duo-finds-saml-vulnerabilities-affectin... is a post from 2018 about it.