Interestingly there are no photos or video of Egan publicly available. All we have over the last 30 years is his/her/its textual output. I'm 50/50 on whether "Greg Egan" is in fact a LLM.
About 20 years ago, there was this individual on Slashdot that was frequently commenting, quite knowledgeably, on many many subjects. I am still wondering if it was a test of an expert engine.
I've seen LLM output. If Greg Egan is an LLM, you can come to my house, choose any hat within it, and I'll eat it.