Here is the blog entry from the guy who allegedly listened to the last 20 minutes of the recording
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For non-Russian speakers
(1) the alleged context of this leak was a visit from the author of the blog to his friend, a high ranking government official
(2) not much info is given apart from that the last 5 seconds are dramatic, communication with military ATC is in Russian, no apparent misunderstanding. No outsiders in the cockpit. Pilots were under stress to make it to Smolensk on time, arrival time to destination features several time in conversations.
(3) recording has a lot of noise and is not very intelligible, however the transcript was already available, with approvals by both Russian and Polish side.
(4) in the final stage of the flight it appears that pilots were trying to make visual contact with the ground. it does not state if approach was visual or PAR. in fact the author of the blog professes to know nothing about aviation.
(5) it mentions that the Russian side was ready to release the transcript of recording but Polish side insists on waiting a bit longer (until after the funeral?)
Could be fake but somehow does not feel like it watching the rest of the blog. The guy owns Aston Martin, why does he need cheap attention?