Is it additional or farther from the reality?
To be as concise as potential, farther refers to literal distance, whereas additional refers to metaphorical distance. Now, that does not appear to be appropriate to me. Nothing may very well be farther from the reality is, the truth is, appropriate. It is not bodily distance that separates something from the reality!
What’s farther away?
farther. Farther means a larger distance away.