You may think 5 years is too short, but you do need some expiration date for non-critical data. Without an expiration date, whoever manages the data has to go into CYA mode and keep it forever. That gets expensive - it's not the cost of raw storage, it's the cost of ensuring that everything is kept as systems change.
How does showing how to fake the lunar landing images show that they weren't faked?
Articles like this, that take the Apollo deniers seriously, are much more of a problem than the deniers themselves.
Also, nice ad for Nvidia, Slashdot.