SB, It was on the 787, unfortunately the previous company didn’t give guidance on the landing fuel level required to avoid cold soak frost. Neither did they advise what destination temperature was likely to result in NEI.
Historically there are instances of NEI in temperatures up to 20 degrees with high humidity and very cold fuel. The 787 composite wing tends to keep fuel temperatures much higher than conventional metal wings (so I suspect the air trigger temperature would be much lower).