Concerned about loft storage of discs

Looking for some feedback. I’ve been collecting Blu-Rays for years. I moved out my parents a couple years back. Due to the size of my collection and my house not having enough room, I have been storing them at my parents in their loft since moving out, regularly going there to bring over ones I want to watch, till I can get a long term storing solution in place.

I’ve been seeing discussions and articles pop up recently regarding ‘disc rot’. It’s not something I’ve heard about until very recently, and it’s been causing me some anxiety about my collection. I regularly bring my discs over and have never run into any issues. I’m just anxious I may be causing damage to a collection I hold very dear, due to temperature fluctuations.

Is ‘disc rot’ something I need to be concerned about, or is it blown out of proportion? As an extra note, all of my discs are stored in their original casings, inside plastic ‘very useful boxes’, as opposed to being out in the open or in cardboard boxes.