Posting a video/screenshot of someone being really fed in a game proves nothing
In order to prove that damage is too high in the game, snowballing is out of control, or really any balance claim in general, a single anecdote says nothing.
You need to use empirical data from tens of thousands of games or just a few games (like in the case of LCS balance claims). This could be posting winrate/banrate/pickrate trends of top laners, posting data about which tower falls first in most games, or something else along those lines.
Anecdotes from one or a few games mean nothing when it comes to making claims about overall balance.