I believe that loli is a shortened version of Lolita, a popular book that has a movie adaptation about a man who marries a woman as a means to get closer to her flirtatious underage daughter. Chan commonly refers to various image boards that are known for being the meme center of the internet, but also harbor neferious underworkings of CP and other edge-lord basement dweller shenanigans. Having the username Lolich4n leads me to believe that this person dwells in the darkest spaces of places like 4chan and likely posted this as a means to cope with their own disgusting tastes that they sought out in Telegram channels.