First of all, you don't get to decide what is and isn't a "waste" of taxpayer money. And I'm confident you are not informed enough about this subject to make that determination.
Second of all, the percentage of "waste" is absolutely relevant when the remedy that Trump and Elon are proposing and implementing is the complete shutdown (and perhaps elimination) of the agency, and the freezing of all of its funding. if it were found that 0.1% of the money spent by USAID had been "wasted" by someone's determination, that would obviously be an incredibly small problem probably worthy of a couple of PowerPoint presentations about spending discipline, not an all-out public crusade against the organization and its mission (including Musk calling the organization criminal and accusing them not just of waste, but of fraud). You can't possibly be so dense to think that the examples you posted, even if true, are anything that should rise to the attention of a national media firestorm. Expecting some sort of mythical perfect efficiency out of government, where not a dollar is "wasted," is obviously completely unrealistic.
To paraphrase Jamie Raskin, if you really want to find wasting of taxpayer dollars, you can probably go over to DOD and find a half-dozen boondoggles that involve questionable expenditures that are orders of magnitude greater than the pittances you're talking about.