GAO audit is not a perfect tool, the evidence is a $2 trillion deficit that is ballooning every year. Very easy to pass GAO audit as long as there is some "paperwork" backing the expense.

What DOGE/Musk is doing is auditing expenses not in terms of "have these expenses been properly authorized with the paper trail?", but rather "are these expenses vital for the US taxpayer, can we remove them?"

GAO can only find some bogus expenses without paper trail

DOGE is funding expenses with proper and perfect paper trail, but ultimately unnecessary for the US taxpayer