What is the opinion of Reddit about the
Godinger Cold Brew Coffee Maker, Iced Coffee Dispenser – 1 Gallon (3.78L)?

You should just make it yourself. It’s super easy. You could even get something like this that makes it super easy: https://www.amazon.com/Godinger-Cold-Coffee-Maker-Dispenser/dp/B07ZKZM8BC/ref