"Someone" Desperately Intervened to Save Stocks Yesterday

The Central Banks are getting desperate. The interventions are so obvious now you’d have to be on drugs not so notice them.
On Monday afternoon, at 3PM “someone” stepped in to prop up stocks. They did it again yesterday at 10AM. These were obvious interventions.
How do we know this was intervention and not real buying?
Because no real buyer guns the markets 20+ points higher in a matter of minutes.