So you're saying Nasuverse plebs would know a being called Sefar did in fact come to attack Earth 14,000 years ago, but the specifics like her being a Titan from the Umbral Star, her Anti-Cell properties, and some of the other deeper stuff is only known to those with access to arcane knowledge/old records?
Also, yes I did look up the actual Sefar wall paintings, and the ruins seem quite cool even without a Nasuverse invented backstory.