Here are a few options for a formal rewrite, depending on your preferred focus:
Most formal and direct:
NHK Investigation Reveals Organized Xenophobic Misinformation Campaigns Against Muslims in Japan
Focused on the impact:
Report Exposes Systematic Anti-Muslim Disinformation Campaigns in Japan
Concise and professional:
NHK Findings Highlight Rising Xenophobic Disinformation Targeting Japan’s Muslim Community
Recommendation: The first option (“NHK Investigation Reveals Organized Xenophobic Misinformation Campaigns Against Muslims in Japan”) is the most balanced and maintains the gravity of the original report.