> now it's making me wonder if Discord is really archiving CSAM material for two years and not helping law enforcement unless a proper warrant is involved

Yes, of course, to both of those. Discord is a for-profit business with limited amount of humans who can focus on things, so the less they can focus on, the better (in the mind of the people running the business at least). So why do anything when you can do nothing, and everything stays the same? Of course when someone has an warrant, they really have to do something, but unless there is, there is no incentive for them to do anything about it.