After playing a recent 4v5 in ranked, I don't believe in ELO Hell anymore

Yes, I was on the team of four. Our teammate left just before two minutes in. The entire game, the enemy teamed abused the hell out of the 4v5. But, I learned that game how to play from behind better. Coincidentally the next game my team rolled. Almost as if the game was stacked in our favor.

So no, Elo hell does not exist. Those games are simply to improve your skills in some sense, and in time a counter balance will arrive. Be honest, you've been the team of 5 before where you win literally because it's 4v5 and pretty much only that. Sometimes you get free wins, sometimes free losses. Either way, you're learning, whether it be maintaining a lead or to play from behind and capitalize on mistakes.

That game, a Silver IV 4v5, actually legitimately taught me a lot. Probably one of the most informational games I've played, because I learned how I need to properly ward if behind, and how to play when at a disadvantage, and I learned how hard I can be punished for small mistakes, like forgetting to ward or not sweeping a brush.