If military personnel from France, Poland, Germany are placed in Ukraine, and Russia then attacks one of them, too bad soo sad. It does not trigger the NATO article of responding to an attack. It simple does not apply.
If we have a moron residing in the White House who wants a world war, then they can pretend otherwise, but I think that really could tear open the fabric of the country. Putting the entire country at risk of nuclear attack for no good reason could rip the country open.
If military personnel from France, Poland, Germany are placed in Ukraine, and Russia then attacks one of them, too bad soo sad. It does not trigger the NATO article of responding to an attack. It simple does not apply.
The author, I think, is trying to say that Russia will attack Germany, Poland and/or France itself (as well as the troops in Ukraine), which WOULD trigger the NATO defense pact.