Conspiracy theories are in conflict. Causes of inflation are very complex but cost of vinyl certainly is not a metric. In the US, costs of food, housing, and energy most certainly are used to calculate the inflation rate.
https://www.brookings.edu/articles/how-does-the-government-measure-inflation/#:~:text=The%20government%20measures%20inflation%20by,and%20services%20to%20previous%20prices.