September 9th Gov Liquidity Support

Can someone who actually understand please comment. So it's quite clear that on Sep 9, the Us Dept of Treasury is beginning the buyback of 4 billion dollars of bonds. From what i understand, in layman terms, this means they are printing money to buyback old bonds to stabilize and lower the yield interest rates. OK so if this is another covert money-printing operation, won't this cause massive inflation in the coming year and the value of the dollar to drop? I understand, I think, that the lower interest rates will ultimately allow Corporations to borrow more money at lower rates and ultimately "maybe" increase shareholder price. But what does this mean for someone sitting on cash and not invested in the stock market at the moment?