Better to rely on news from places other than a disgraced British tabloid. Here's coverage from the time of his conviction.
https://www.nytimes.com/2007/01/09/w...09germany.html
I haven't followed this closely, but it appears that a key issue was that it was never terribly clear how much he knew. Although German police wiretapped him, at the time, they never found anything incriminating, and he maintained his innocence. The ultimate case against him relied on evidence extracted (under torture?) from other suspects.
My understanding is that prosecutors established, from that evidence, that he knew about the plan to hijack planes, but not what the plan was about what to do with them. In light of past hijacking practices, he may well have expected they'd just be flown somewhere as a kind of kidnapping, in order to allow negotiation of demands. As such, he ended up being convicted as an accessory with regard to the deaths of those on the plane (since he should have understood what a grave risk he was subjecting them to, even if he didn't understand the plan to use the planes as weapons), but not the overall 9/11 attack. Basically, he got a sentence commensurate with the crime he thought he was participating in, not the one he was actually participating in.
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