The lore we know about the Argonians is pretty clear on several notes. Lore isn't just based on lore documents. It's based on observable game content through events and dialogues such as Travelling-New-Woman from ES III: Morrowind. Much of the lore was conveyed through the Duology straight from the words and thoughts of Mere-Glim, one of the principal characters and an Argonian.
I'm not even sure what you're trying to say but the books are canon and as such are irrefutable sources of lore. Events first referenced in the book are also referenced in Skyrim. That includes everything about what happens in Black Marsh and Morrowind after the Oblivion Crisis including the Ministry of Truth crashing into the city of Vivec and the eruption of the Red Mountain that destroys Vvardenfell, as well as the existence of the An-Xileel faction to which you often refer.
The absence of evidence is not proof of a proposition.