not letting the free press or Frontex anywhere near the border
European Commission said that it is going only to sent Frontex officials, who are forbidden from using force against migrants (besides acting in the self-defence). Such people are completely useless in this hybrid warfare as are people watching if Polish border guards won't push invaders back to Belarus once they cross the border.
In other words, EU already made clear that necessary means can't and won't be offered.
And Poland is keeping them out mainly at the behest of Germany. They want to go to Germany. What's Poland to do, lock them up in detention centres in Poland?
As much as the German globohomo want to replace their population, they hardly want whole columns taking over at once, like some kind of Moroccan Green March. Otherwise it looks a bit too much like an invasion. Not what you need when new lockdowns are incoming thanks to the leaky vaccines, and a government formation with parties that have never formed a government together at the federal level.