When it comes to looking the pool, that means that the devs. look the initial amount of e.g. eth/shitcoin, every increase of eth in the pool above is then due to the price change.
it's wrong. More ethereum getting pooled / used to bought token and that means it was increasing the liquidity pool token. When you're adding liq pool and this will not give any impact to the price but that would be different when it comes to someone who has bought shit token used ethereum as it will be also pushing the price to go up.
Total token pooled gets decreased - ethereum pooled gets increased = triggering the price to increase.
It seems like this is not yet available on uniswap v3 and I'm sure that was still using uniswap v2.
How many ETH did they in reality looked in the beginning once they setup the pool?
it can be seen from uniswap analytic page. you can see it here
https://v2.info.uniswap.org/token/0xbc7250c8c3eca1dfc1728620af835fca489bfdf3You can try to clicking on liquidity tab. It will be showing you how much ethereum pooled at the beginning. You can also see that on the transaction history from that page. There are add and remove tab. That's about adding and removing liq pool.