Love to see you playing Minecraft again! Couple of tips from when I played this modpack: Autohammers are your friend and don't require power to work, get into chickens early as getting full 10-10-10 chickens take time, and setup the function storage drawers to help with the chickens.
He must have had his in-game volume quite low. Those skeletons/zombies were very loud to me, but he didn't notice them until they were hitting him. Hearing the constant mob noise and him not reacting or noticing them is anxiety inducing. I don't get how someone can play a game like this for so many years, have thousands of hours in modded minecraft alone and still forget how to do the basics.
Is anyone else watching this years later yelling at past Jack to just craft the iron nuggets into bars at a crafting table instead of smelting them? lol