Cairo doesn't have even an ounce of power in his body anymore. He was far stronger than he was 10 years ago but he still fought a hundred enemies at the same rank as he is
Not to mention, it's not like those monsters are weaker than most beasts at their rank. In fact, they are far stronger than mid-level Archmages. It wouldn't be too much of a problem for them to fight and defeat a mage at their level
If Cairo's accomplishments were known to other people, they would surely flip out. That's a hundred times of Cairo's number! 1 versus 100 when his enemies have the same cultivation rank as he does!
No one might believe even if Cairo spread out his achievement. It was too much of an unbelievable thing. It was a feat that was hard to fathom