The article doesn’t cite, and I’m pretty sure this is the research they are referring to:
Intranasal Human NSC-Derived EVs Therapy Can Restrain Inflammatory Microglial Transcriptome, and NLRP3 and cGAS-STING Signalling, in Aged
https://isevjournals.onlinelibrary.wiley.com/doi/10.1002/jev2.70232