The narrative and their equivalent of preliminary report was delivered by MAK to Rosaviatsiya, who then posted it with its own directives to the air carriers (mostly about revising the sim programs). Here's one copy if anyone's interested:
https://bmpd.livejournal.com/3646419.html
Here's my translation of the pertinent part:
"From altitude 260 ft, acft started to settle below the glideslope. At alt 180 ft a TAWS warning came on. At 180 ft the throttle was added (...) that made the IAS grow at the time of crossing the rwy threshold to 164 knots, at alt 16 ft to 170 kts.
"After adding the throttle, the Capt. made several large size (to full stop) opposite deflections of control stick, according to commands of TAWS, which lead to changes of pitch angle from +6 deg to -2 deg.
"First touch-down occurred 900 m from threshold at speed 158 kts with 2.55 g load, with following jump altitude of 6 ft. In DIRECT MODE, automated extension of spoilers is not implemented, and crew did not command a manual extension."
So, the key problem was that when TAWS barked RETARD! RETARD!, the Captain suddenly and inexplicably pulled the sidestick full aft, and caused the ship to balloon. Seeing what he's done, he then immediately dialed full nose down, thus starting the porpoising.