I would say this isn’t true at all. Everyone who would know about RV knows about Twice. Just RV music is more catchy to what is popular in Korea as opposed to Twice currently.
Catchiness only has to do with longevity. People don't know what the music sounds like before it's released. The initial figures such as chart debuts and ULs from the first few days are the number of people checking out the song without even knowing if it's catchy yet or not. If you are popular, people will check out your music at least once. Looking at the initial chart debuts and ULs, it's clear when you compare the two based on the numbers; Red Velvet still has some public interest, unlike Twice.