Both the opamp terminal have tied to the same AC signal
Using the classical calculation methods for opamp based circuits it is easy to show that the closed-loop gain Acl for the shown circuit - independent on the parts values - always is Acl=+1.
Therefore, we are free to select the feedback path - and the loop gain - according to the stability requirements (phase margin). For this reason, we also can use opamps that are not unity-gain compensated.
Comment: When the switch is closed, R11 has no function and the circuit resembles the classical inverting amplifier with gain Acl=-R7/R10 .