Which Expression Is Missing From The Proof

Key to that notion of expression is that the signal sent MUST reflect the user’s preference, not the choice of some vendor, institution, site, or network-imposed mechanism outside the user’s control; this applies equally to both the general preference and exceptions.

which expression is missing from the proof 1

My friend has been on away status (yellow marked) for over 5 days on Skype. I just want to know in which case on his end it shows me the away status. Did he uninstall the skype app on his mobile? Or

which expression is missing from the proof 2