Not sure he's repeated that line for some time, here's something I've seen elsewhere on here that might add a bit of perspective to the difficulty with witnesses some years after a fact.
The claim that eyewitness testimony is reliable and accurate is testable, and the research is clear that eyewitness identification is vulnerable to distortion without the witness’s awareness. More specifically, the assumption that memory provides an accurate recording of experience, much like a video camera, is incorrect. Memory evolved to give us a personal sense of identity and to guide our actions. We are biased to notice and exaggerate some experiences and to minimize or overlook others. Memory is malleable.
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Myth: Eyewitness Testimony is the Best Kind of Evidence
Activities in this unit reveal how eyewitness testimony is subject to unconscious memory distortions and biases even among the most confident of witnesses.www.psychologicalscience.org
One has an insurmountable instance of where the theory can be subject to test conditions in the playground incident where the witnesses on the scene got more of an eyeful of CB's private parts than was warranted.
Was he masturbating or was he wild peeing, whatever that might be, but it certainly does conjure up an unwelcome picture of events neither of which should have happened in a children's playground in the presence of the said minors.
Did I remember to say that he was doing whatever he was doing with his pants around his ankles.
Nothing in CB's actions should be countenanced if the scenario is to be believed. And it appears it wasn't believed.
Very difficult to listen to and assess when recounting the experience as young adults appx seven years down the line from the children they were when the weird event they witnessed sent them running in alarm to their parents.
Anyway a dilemma did not arise in the judgement of the Braunschweig court in which the blanket judgement that all trial witnesses to each of the five independent indictments were liars prevailed.
Seems that covers even this guy

Fall Christian B.: deutscher Rüffel für portugiesische Behörden
11. Tag im Prozess vor dem Landgericht: Verhandelt wird in Braunschweig, ermittelt europaweit. Mittwoch reist ein Scotland-Yard-Mitarbeiter als Zeuge an. Seine Aussage hat Bedeutung für die Glaubwürdigkeit des Kronzeugen.

- April 26, 2024: On the eleventh day of the trial, another witness from Portugal is heard. The man had held the defendant on a playground in 2017 until he was arrested by the police. According to his descriptions, Christian B. first tried to move away and then claimed that he had only urinated. At the same time, the presiding judge UE reprimanded the work of the Portuguese authorities.