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.

vostok 1

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.

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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?' 

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.