If he can't use CoO there then he wouldn't land any hit no matter how fast he goes, coz Katakuri would be dodging that.
Unless you think Katakuri stopped using CoO too after understanding it.
What's next....
Kata and Luffy didn't use CoA... Weren't actually going fast (which you only say)
Imagine Luffy learns and upgrade CoO, unlocks FS just to not use it with Snakeman...
Katakuri screamed too and was still using CoO