What you say here is true, but for 1 thing:
"So, the amount of BTC miners have to sell to cover operation costs and satisfy shareholder profits actually increases."
With halving, miners' operational costs have not increased, there's no need to to sell more BTC.
You could mean that they will have to sell a bigger share of mined BTC, but the amount stays the same all else being equal. I don't see how this alone can have a detrimental effect on the price.
All the rest is cool, but you leave out
ETF buyers which take some warmup time to study, consider ther competition, etc , so I don't think it's there yet.
My guess is we'll see real institutional demend in a year or two.
But this thing is hard to overestimate.