Umm, read the line again: "Polish troops
reportedly [emphasis] attack German radio station at Gliewitz" and then read the wiki page you linked. Then consider that it is Sep 1939, not later when people knew the facts.
Do I really need to join the dots any further.
Re the Kiel/Konigsberg message bombardment, yes, there is a typo in the GWX files. You can edit it yourself or wait for it to go away in October.