I don't want to turn off to appear in the Notification center
JFYI, turning that option off, does not stop the notifications appearing on the phone.
This official support page says:
"Toggle Allow Notifications on.
Ensure the Notification Center has been check-marked
Ensure Show Previews is set to Always (Default) or When Unlocked."
If I uncheck in ios settings "Notification Centre", notifications won't appear in the Notification Centre.
The notification will still appear on your phone, anyway. I re-tested it just now in order to demonstrate it to you that it works in this way. I disabled the Notification Center option at Strava, and then synced an activity, in order to generate a notification from Strava. It did not alert me on the watch, and it still did alert me on the iPhone.