It can if certain techniques are not used during Rhinoplasty
Yes, your nasolabial angle can get more acute after your rhinoplasty. This can happen when you interrupt forces that hold your nasal tip up. The exposure that you do can also interrupt forces that hold your tip up. Trimming the top of the tip cartilages and interrupting the connection between the tip cartilages and the lateral cartilages higher in your nose can also cause your tip to descend and decrease the angle.
Also, interrupting the connection of your tip with your septum can also...