Via the support, I learned that the fact_remediation (and all other SQL export reports) do not have access to the same data as the rest of the console. This explains why fact_remediation returns a different set of remediations from the top remediations document report. Apparently, this is not considered a product defect either (allthough it’s not clearly stated in the InsightVM documentation)
So a while back I just ended up writing a python scripts which convert a HTML version of the top remediations report into a CSV list. See the link below, note that I’ve chopped away our organization-specific stuff from the scripts, but you should be able to simply convert the report_data variable into a CSV file quite easily!