There are still some Spirit filled orthodox Lutheran synods that will continue to hold their memberships (LCMS, WELS and a scattered few others)
I’m pretty sure when the author referenced “Lutherans, Episcopalians, Presbyterians” he had in mind the apostate or in danger of apostate mainline. ELCA is not LCMS, WELS, etc. ECUSA vs those that have jumped ship to foreign oversight. PCUSA is not PCA, OPC, etc.
1 Kings 19:18
Yet I reserve seven thousand in Israel—all whose knees have not bowed down to Baal and all whose mouths have not kissed him.”
I imagine that this will pretty much still be the same.