Rimuru got erasure protection so that makes sense. Not sure why Saitama is above Zeno though. But at the same time he is a gag character so he gon do something goofy like how he kicked a portal and negate it. Don't understand why people don't believe Saitama has gag character powers, he legit got scratched (and hurt) by a random cat on the sidewalk but also tank world destroying punches.