Deflation Vs Inflation

I've read a lot of posts here debating this but they haven't really come to a conclusion. Are we actually resolved that after the merge, Eth will become a deflationary asset? Some people say that with 90% decreased issuance that the total supply will continue to rise, just slowly. Others say that the total supply should drop by 1-2% per year. Does anyone actually know the answer,

(When I say deflation, I specifically mean reduction in total supply rather than value appreciation, which is more or less a certainty in my eyes)

Also does anyone actually know a more accurate date than the first quarter of 2022? Because I'm thinking about selling my mining rig and this would be very useful information