They're referring to the $35 monthly insulin cap contained within Biden's Inflation Reduction Act. Perhaps the Department of Health and Human Services is a good enough source for you?
Effective January 1, 2023, out-of-pocket costs for insulin are capped at $35 per monthly prescription among Medicare Part D enrollees under the Inflation Reduction Act (IRA). A similar cap takes effect in Medicare Part B on July 1, 2023.
https://aspe.hhs.gov/reports/insulin-affordability-ira-data-point
Bit of advice: If you're not familiar with a situation, you should do deeper research than a quick Google search and stopping the moment you find an unrelated article that affirms your bias.