Thanks for those links. So NLT
did actually mentioned Unity in an interview back in 2021, I did not know that. If you search their Discord for "Unity", the most recent mention of Unity is even older (from 2020), and there are no more recent reports from themselves that ever mentioned Unity. Again: they were talking about "improving their engine" or something along the lines, but never mentioned the exact engine they will be working with for future projects.
// EDIT: Found the
post I had in my mind.