I speak only for myself, and not for Jon, but…
Tomster, I’m not sure labeling individual synods as ‘truly Lutheran’ or not would be particularly useful (or charitable). Even in the synods that have drifted furthest from orthodoxy, there are still good Lutherans trying their darnedest to “right the ship,” as it’s been said.
That said,
some of the ELCA’s leadership, and
much of its academia, have drifted from confessional Lutheranism toward mainstream liberal protestantism, maintaining a shell of Lutheran traditions, but professing a belief that is -and I understate- nebulous. This has been noted by other Lutheran bodies;
the LCMS no longer considers the ELCA an orthodox Lutheran body, the Mekane Yesus Church (the major Lutheran body in Ethiopia and nearly twice the size of the ELCA)
dissolved its fellowship with the ELCA and is seeking closer ties with the LCMS, and the Malagasy Lutheran church -despite the ELCA’s fierce PR campaign to say otherwise- appears poised to do the same. A return to confessional Lutheranism is rampant across Lutheranism, even in those synods that have strayed.
But I cannot stress my first paragraph enough. Lutherans exist even in those ‘Lutheran’ bodies that have grown most ‘ill.’ It would be unfair to consider them all part of the same “granfalloon.”