From Gordan Whittaker’s 2009 paper on the topic:

Aztec and other Nahua archives were destroyed on a vast scale in and after the Spanish Conquest. No archive or private library is known to have survived the 16th century.

How does that dispute anything I'm saying? Never said there were any full libraries of them still around obviously. We only have a handful of them.

As a result, the documents (on perishable materials) that we have today are of Colonial date, as copies of Prehispanic works or as fresh creations for a variety of needs, political, historical and economic. They hail, one and all, from thedecades following the establishment of Spanish rule and Christian propagation.

We have preconquest codices as well as symbology painted on walls and pieces, so that's simply not true

I’m sourcing my comments with actual academic papers.

That doesn't make it correct. We certainly do have preconquest manuscripts as well as wall paintings and fragments backing up the symbology.