Look at a map: Poland has a long common border with Western Ukraine, but instead it offers to fly the other way, to Ramstein, more than a thousand kilometers from Ukraine.
Once the planes are in Ramstein, what do you do? Fly them back to Poland? That makes no sense, and according to the article, the idea is that "the Polish government would sidestep the logistical challenge of getting the jets over the border".
That leaves the three other NATO countries bordering Ukraine: Slovakia, Hungary and Romania.
But Hungary refuses to let lethal weapons transit its territory en route to Ukraine, so strike that. Slovakia shares only a short border with Ukraine - about 80 kilometers - and it's sandwiched between Poland and Hungary; too easy for Russia to watch.
That leaves only Romania. How do you get there from NATO territory? Not through Hungary (see above), so you're left with a ridiculous roundabout route like Germany -> France -> Italy -> Greece -> Bulgaria -> Romania.
Do they all agree to it? Why in particular would Romania be willing to tackle "the logistical challenge of getting the jets over the border" which Poland (and Hungary) won't touch with a bargepole?