Sorry to be the "um akshually" guy, but that's not true; it's likely kojima just thought the english acting sounded cooler
He or someone at konami was displeased Jeremy Blaunstein tampered with the script because he thought he was "improving" it, I know because Blaustein bitched about it himself in an interview and about how he was never hired again by him and how his approach was better in his mind, and then twin snakes scrapped his translation and used a new one.
When I found out I went "so That's why only mgs1 had snake do those macho one-liners.."
Written by the man who did it
www.polygon.com
A sticking point to me is how he changed Psycho Mantisis' last words from being about him being nostalgic for his mom, to him feeling nice for doing a good deed