Question about Cybex Solution S2 I-Fix

No, only the headrest can be adjusted in height. And there is a certain amount of (slight) movement to the rear, but this does not correspond to a reclining position. More like an inclined sitting position.

The seat back can relatively freely bend in some range - so it's position just follow the seat back of the car seat - if you can reclin the seat in your car then it will follow it (but not very much tbg)