The SPBUYUP index has not been shown in a published idea on Tradingview before now (I checked). It is the index which tells how much companies are buying back their own stock to keep the S&P500 afloat.
So if this fails, market 'manipulations' of the S&P500 could fail. Of course, this not the only thing that influences the S&P500 but it is a significant marker of influence or lack of it.