Calculating LT1 and LT2 approximately without a blood test?

This LT1 being very close to LT2 for eltite marathoners is something I’ve read a lot. But I’ve never seen any data. Of course, if they use baseline + 1mmol and a definition for LT2 which yields a lower conc this may be true.

And what is close, this is recent data from the breaking 2h project. I guess these guys can be called elite:

Is this close? I have no idea.

apart from this, I have no idea what you guys actually argue about. Skiba does not use LT1 or LT2 in his training model. Good. And now?