Your plant looks great. Don’t let that redditor bother you. The vines are beautiful but they will grow bigger if you give it something to climb on like the curtain rod you mentioned. I think that guy was saying your plant was light deprived because of the leaves being smaller than the older ones. It’s normal and not all plants have to look picture perfect. Your plant is healthy and looks great. To be honest I am jealous that I don’t have such a lush and healthy plant.