That's how it would look even if the parquet had been free of active mold growth, but since there's a history of mold issues, I'd get a mold remediation contractor out there to confirm that the mold issue is gone before you put down new floor finish. Just to be sure.
source https://www.inspectorsjournal.com/topic/18833-black-glue-on-concreteis-it-dangerouscan-i-leave-it/?do=findComment&comment=172345
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