Can i delete old presets?

Over the last few years I have made various develop pre-sets to speed up my workflow. There are some that I won't be using any more on new photos. Can those pre-sets now be deleted, or do finished images in my catalog that i have used them on still rely on them? For example if i deleted those pre-sets and then at a later date wanted to go back and export some images that had used them, would i then run into problems?

I'm a bit unsure because in the history panel after I've used a pre-set there's only 1 entry with the pre-set name, even if the pre-set has done multiple things at the same time. Would Lightroom always need to know what that pre-set contained?