>Huge amounts of cheap debt allow companies to buy lots of stock, driving up prices.
Companies don't use debt to buy stock. Taking on the debt to do that would depress the stock price the same amount that the buying would attempt to appreciate it.
>All of this causes massive asset price inflation.
This would be reflected in the CPI.
>Stock prices are detached from actual revenue
No they aren't. See UBER/LYFT/AAPL.
>so the FED gets to claim "there is no inflation"
The Fed does not claim that. They claim inflation is nominal near their intended target.
Finally, stop saying FED. It's not an acronym.