It is true that Yuri Gagarin ejected from the Vostok 1 before landing. This was because the USSR assumed it wouldn't be recognised as a record orbital flight by world record regulations. The truth was investigated by the researcher James Oberg and has now been known for decades. It does not imply a fake mission though as claimed.

It is said by some that the very first Manned orbital flight by the USSR was all a hoax too. 'Did you know that the Vostok 1 had no portholes?' 

vostok 1

There are three portholes. Why this claim of having no portholes supports the proposition that the flight was a hoax I have no idea.

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