More or less, yeah. It's not as directly defensive as salary hiding, which can obviously help conceal everything from wage collusion to Ledbetter v. Goodyear s

More or less, yeah. It's not as directly defensive as salary hiding, which can obviously help conceal everything from wage collusion to Ledbetter v. Goodyear style inequities. But it still stops labor from sharing information and helping to share in concessions. I didn't include it above, but a related part is that layering on NDAs makes it harder for non-employees to get involved. If you post your whole contract online, a random employment lawyer might happen by and go "hey, you're getting screwed, 3.A.ii is non-standard and probably illegal". But if you restrict it to employee viewing and low-specificity discussions, you're less likely to have lawyers or activists get involved unprompted.