If the azimuth is entered as its “true”, not “magnetic” value, does that mean that the SunEye should be oriented true SOUTH when taking Skylines?

No. Always use the compass (magnetic) heading for the 110 SunEye’s orientation when taking Skylines. The compass heading for the 210 model is automatically adjusted for declination and will direct you to true South. When you enter the azimuth value, the true/magnetic setting is only used as a convenience for entering that value. It does NOT affect how the SunEye should be oriented.