At current price the monthly emission of AEON is equal to ~1.3 BTC. ~15 BTC annual.

Are you sure? Considering this sheet: https://docs.google.com/spreadsheets/d/13AjSZJcYd5UoMCBRj3-9XliUhPUkagEjF_NzXsDmLgQ/edit#gid=0

At 15.831.459 AEON supply we should have 3589 AEON mined daily. That is 0.09 btc or 2.7 btc a month. Yearly emission inflation is 8.27%

Is that spreadsheet inaccurate?

I used block reward (4.85) from one of pools, 4 minute block time and current price.