If CB told the BKA in 2013 he wasn't in Luz, and Wolters tells us now he can't place CB in Luz, then the two tie up imo. Strangely they questioned CB when he wasn't "the" prime suspect but now he is they won't.
At least one hundred and ninety six leads were followed for the purpose of elimination in 2013. If Brueckner was one the fact he didn't become "the prime suspect" is because
at that time no evidence was found in justification.
The fact he became "the prime suspect" in 2017 was because the police had information which justified him becoming a person of interest.
Bearing in mind that some of his lewd practices were now known about.
Absolutely nothing "strange" about it but the fact it was a long time coming.
Neither was there was anything strange about him being constituted argiudo in 2022 by the Judicial police when the evidence warranted it.
The problem you have highlighted there is that if he gave information about his whereabouts in 2013, that will be expected to match up with whatever information he gives in 2022.
None of which will be reliant on metadata just good old fashioned information gathering.