The prerequisite is LosslessSupportSystems but there is no tech named that in Yor
There is. The generic name of that tech is named that, and prereqs back to itself. Not sure why it works without error in the default game, or if it's a bug that it isn't showing up in the default Yor tech tree in game.
Either way, just remove the whole thing unless you want to experiment with the prerequ tags to actually add the tech to the tech tree somewhere. (you could try the two former spec techs above it in the file) You may encounter more of those bugs if it's used that way to "hide" techs in the default game and we are not supposed to do it that way when we mod.
Or better yet, where is the file that allows you to create/customize new techs?
You are pretty much doing that if you have renamed those files and renamed the names inside. Not easy being a modder 