It was indeed but the OP concerns the 11th anniversary.
From yourself
‘While we are on the subject of cites, have you found one yet which confirms annual interviews each anniversary with the exception of the tenth?’
It is my opinion that your claim is that the eleventh anniversary - this year - is the only year that an interview has not been given.
I base that on your statement "The McCanns have given an anniversary interview every year since the PJ reopened Madeleine’s case".
Knowing that Kate and Gerry have maintained a low media profile, for the simple reason that in my opinion one is not required as long as the PJ and SY are on the job ... I searched for confirmation of your premise and found none.
You have not been able to locate a cite in support of your assertion either.
In the interest of accuracy ~ I think you should review your posts to make appropriate amendments where there is reliance on flawed information in support of your argument.