Campagnolo 10s barend shifter compatibility

[Gsinill]

As far as I remember, I got this set of shifters described as 10 speed.
The rear one is indexed with 18 clicks but I assume it can only be used for 10s, not 11 speed, correct?

https://uploads.tapatalk-cdn.com/20200603/cf65bb118b5adac59c3289d6a5f95ea1.jpg

[Hindmost]

18 clicks? Interesting, must be because it is rotating almost 360. 2 x 9 = 18. A 10 speed up shifts 9 times. I don't think it goes to 11.