[6] "Inner Paths (to Outer Space)" was written improvised for several months with all the group members on psychedelics, and features Demilich vocalist Antti Boman performing growl vocals at the end.

[10] The artwork for Hidden History of the Human Race uses the front cover of Brian Aldiss' novel Space, Time and Nathaniel (1957)[2] created by British painter Bruce Pennington,[1] which the band chose to use before they recorded their debut LP.

[11] With Hidden History of the Human Race, Blood Incantation went out to produce "a genuine and distinctive album of monumental and epic psychedelic/brutal/progressive/technical/ambient/funeral death metal like no other," summarized Paul Riedl.

[5] While continuing the cosmic soundscapes and themes of Starspawn (2016),[12] Hidden History of the Human Race is more focused and consistent compositionally[12] and more upfront and harsh mixing-wise, with an increase in meaty guitars, clear drums, and reverb and delay effects.

[1][6] Hidden History of the Human Race presents a move of death metal in the 2010s towards spiritual tinges away from extreme cynicism, which was also showcased via the works of Toronto-based Tomb Mold and the Philadelphia-based Horrendous.

"[18] Christopher Luedtke of Metal Injection noted that the timing of disparate elements, sometimes sudden and sometimes expect, was so "coldly calculated it's unreal;" he particularly claimed that the last track "weaves [multiple styles and layers] so seamlessly and maintains a pace that makes not a single second of it boring.