They apparently copied without attribution in a manner that was a violation? I’m still looking for precise wording of the PEL.
It’s very hard to violate the Apache license, but these are the sort of bozos who could manage it.
EDIT: Here is the PEL. It lacks the attribution requirements of section 4 of the Apache Licence 2.0. So yeah, they managed it.
This is a small technical violation that’s easily remedied, but I understand that’s what got people pissed off.