In the game, you could translate the gibberish that the Lahmu’s were saying if you looked at a Japanese keyboard. The keys on a Japanese keyboard have multiple characters per key, so you just switched the characters around and it was readable. In the anime, you have to shift the syllables they are saying backwards 2 spaces in the Japanese alphabetical order (gojuuon). So さ becomes け, ふ becomes は, etc.
Credits to Japanese twitter user @FGO0TM for deciphering the text. I also lifted some of the translations from Reddit user tagle420 when appropriate.
— 鳥@FGO (@FGO0TM) January 26, 2020