In this day and age, it would’ve been easy for director Tim Miller and producer James Cameron — no stranger to technology — to digitally de-age Arnold to make him look more like the T-800s we met in The Terminator in 1984 and T2 in 1991. Heck, there’s even a creepy new deepfake showing young Sylvester Stallone in Arnold’s role in T2. You can do anything digitally these days. But that’s not the story Terminator: Dark Fate wants to tell. Instead, the sixth Terminator movie — which is blowing off everything after T1 and T2 — is very much interested in aging heroes Logan and Unforgiven-style.
Article source: https://www.cinemablend.com/news/2480297/why-terminator-dark-fate-never-wanted-to-de-age-t-800-with-a-digital-arnold