[1] The hypothesis has no single known proposer, and instead is thought to have emerged over time in response to the Hart–Tipler conjecture, the idea that an absence of detectable Von Neumann probes is contrapositive evidence that no intelligent life exists outside of the Sun's Solar System.
In his 1983 paper "The Great Silence", astronomer David Brin summarized the implications of the Berserker hypothesis: it is entirely compatible with all the facts and logic of the Fermi paradox, but would mean that there exists no intelligent life left to be discovered.
[4] There is no need to struggle to suppress the elements of the Drake equation in order to explain the Great Silence, nor need we suggest that no [intelligent aliens] anywhere would bear the cost of interstellar travel.
This runs counter to the knowledge that the Universe is filled with a very large number of planets, some of which likely hold the conditions hospitable for life.
In the Berserker hypothesis framing, the filter would exist between the industrial age and widespread space colonization.