Bymo
if he wanted to keep the lie that he was super powerful and that he created the chat, he could have lied saying that he had the knowledge of many different universes, including past, present and future, although some of this knowledge is fragmented (which limits his knowledge certain events). for an excuse of your weakness when they met, you could have said that creating the chat was very difficult and he had to use every drop of his power, as a result he was completely depleted and weakened, unable to activate his powers for some time (which can take up to years). and.... Othinus for Waifu! \o/