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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 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

It is a little known fact that the first man in space was actually an American' Iven Kincheloe. The legal height for space in 1950s & 60s was 100,000ft. He flew a top secret aircraft, the X2, to beyond that height in 1956. Yuri Gagarin was the first to orbit the earth in 1961, but was not the first in space.

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