Its an interesting take, bit why is this coded ingroup messaging is communicated to outgroup then?
For a somewhat cynical explanation of why that happens, I recommend https://www.ribbonfarm.com/2009/10/07/the-gervais-principle-....
As with all forms of cynicism, it has a grain of truth. And a much larger grain of truth than is comfortable.
To solidfy the in-ness of the in-group. To underscore that management is better than ICs and ICs are considered other
One example elaborated:
You _want_ most ICs to ignore a negative message that doesn't involve them, and you _want_ to give middle / lower managers the discretion to address an ICs "nonsynergistic" contributions on their own time. It's a signal not a prescription. This allows a public person to make a public statement and set direction without prescribing actions so lower management and ICs can do their thing.
Upper management becomes increasingly vibes-based, from what I can tell.