The phrase "a report argues" is correct and usable in written English.
You can use it when summarizing the main point or conclusion of a report, indicating that the report presents a specific argument or viewpoint.
Example: "In the latest study, a report argues that climate change is accelerating at an unprecedented rate."
Alternatives: "a report claims" or "a report suggests".
Governments must take the lead on reducing gender inequality to unlock almost £10tn of additional global economic output, a report argues.
Apprenticeship programmes should last three years and be as demanding as A-levels, a report argues.
Summer-born children should have their exam marks boosted to compensate for being almost a year younger when they sit tests, a report argues.
In 2009, the homeland security intelligence analyst Daryl Johnson wrote a report arguing that rightwing extremist movements were on the rise.
In 2007, the two men teamed up for a report arguing the next US president should make a low carbon economy a top priority.
In 2015, the Transgender American Veterans Association and the American Military Partner Association released a report arguing that the ban was nothing but harmful to trans members of the military.
The Association of American Colleges and Universities recently issued a report arguing the humanities should abandon the "old Ivory Tower view of liberal education" and instead emphasize its practical and economic value.
Universal McCann, the marketing agency, produced a report arguing that the "age of mass media" had given way to the "age of social media".
The group, the American Cause, released a report arguing that anti-immigration absolutism was still the solution for the party's deep electoral woes, actual voting results notwithstanding.
Covenant Review, the bond research organization, has since come out with a report arguing that the judge was wrong on the first point.
In January, Warren issued a report arguing that U.S. companies get away with crimes that regular people don't because of weak enforcement.
