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Based on the name of the poster "ren" this is likely the same girl from reddit that was outed as being a user from tumblr who would post pictures of people that looked a tiny bit like eric or dylan and tried to pass off that she knew them. One of the pictures was of a middle aged man in a mcdonalds uniform that she claimed was dylan. She would write stories all the time about how she knew them and would very obviously fantasize and glorify them. I very seriously doubt this is Dylan.

This video that has nothing to do with columbine and is sorta Meme video
It has a guy that "Kinda" looks like Dylan in it

As if Dylan would wear a white hat! lol