A bit of luck was with you and a decent amount of skill as well.
I know this because... I bet like you, I have lived driving roads like this for 30yrs. Your video is my everyday drive.
Now... Assuming you know this area, then you know the hotspots for deer and their movement habits in the area based on weather patterns and food/water resources. Knowing these things has helped me avoid most deer for 15yrs while living in a "natural resource" area.
One of the things you didn't mention that you did right or wrong was vision. How do you think you did in that area? Honestly, if it were not for my vision skills and line selection skills, I would have hit many more deer in my time driving in the backwoods of KY.