All of HackerOne's information that you cite is about them being PCI-DSS-compliant or having undergone a SOC2 Type 2 audit. Nothing you link to identifies them as a PCI-DSS auditing company. They are not.
And the "scans" the PCI-DSS standards refers to are standard pen-test and external vulnerability scans, usually conducted by an accounting company who will certify the scan results. They are for known vulnerabilities, things like the version of Apache you are on, etc. None of the reports sent via HackerOne would qualify as a "scan" under PCI-DSS.