Edit: https://arxiv.org/abs/2605.31514
A family member shared it with me. As to the source, I remain clueless.
The source is this (joke) paper: https://arxiv.org/abs/2605.31514
I will save you some confusion by summarizing the argument. The author shows that you can build a computer inside of AoE2. As a consequence of this, anything that can run on a computer can (in theory; obviously not in practice) run on a simulated computer inside of AoE2. LLMs run on computers, so therefore they can run in AoE2, and therefore anything an LLM is capable of, AoE2 is capable of.