Since BlackRock is allowed to buy up its own ETFs, this
means that taxpayers will be eating losses that might
otherwise accrue to billionaire Larry Fink’s company and
investors
What? The sentence indicates a deep misunderstanding of the subject which the author writes about. BlackRock is (mostly) a fund manager: they earn money on assets under management and not (broadly speaking) when the market goes up or down. If the ETFs BlackRock are buying go down, it simply means they are propping up the underlying holdings - the actual corporate bonds. They will then "create" ETF shares and give them to the Fed. Think of the ETF simply as an IOU.BlackRock has also said they will be waiving the ETF fund management fee.