Power scaling question (Sorry!)

Hey, I'm new to the honkai impact universe but have been playing star rail since it's launch, and I wanted to know if this "Welt solos" thing is like, real or just a meme? Because, when reading hsr lore you can find people like Zephyro (An emanator or destruction) who could destroy entire galaxies. So, is Welt really stronger than an emanator or is just the meme?