As I understood what's in the tapes that MAK doesnt want to publish as part of the report, and which Polish experts were let to listen to and made "extracts of") - is the talk between two Russians, the ground controller who did most of the talk with the plane, and one more, who interferes once? twice? Need to watch the video restauration of the flight again.
It is clear from that youtube video that it wasn't one ground controller who spoke with the plane, but that there were two of them, and it is marked who says what.
And, apparently, the talk was a dispute between these two, one was of the mind to prohibit them everything, no 500 metres, forget about 100 metres, to send them off away to the spare airport at once. And the other one interferred, spoke with the plane, and allowed that "trial" descend.
I think what Polish sides plans to prove by having this talk published as part of the report, the gist of it, is that - as minimum one of the controllers - thought that he has a right to close the airport for weather.
And, consequently "if ground control thought his duty is to prohibit landing - why does MAK insist it was not within the controller's power?"