I've also heard that there is a bot on Telegram for buying and selling with LN, but I don't know much about it.
If I am not wrong
LNP2PBOT Non KYC btc lightning exchange is the one you are talking about, well I tried it but it seems it has only traders from specific country not all over the world so if anyone from that region can use it but to me its not really seems to be trusted.
If you wonder how to use it to buy/ sell on that bot via LN then here is the article.
How to Trade Non KYC Bitcoin P2P on telegramHere's the bot : @lnp2pBot