Thinking about this from a writer's perspective, it makes no fucking sense.
Why would Oda make this shit happen?
Why make Ryokugyu come in here for 3 chapters just for this shit?
It added nothing to the narrative, just made Ryokugyu look stupid
the story wouldn't have changed if Ryokugyu didn't come
only thing would be Momo not learning Boro Breath earlier i guess
unless this Boro Breath is all it took for Ryokugyu to go back and say
"yo, there's a dragon dude in Wano that is crazy, we can't go there again"
but that sounds bonkers