Oh yeah? Source please?
I know a guy who knows a guy who used to know a guy who had once seen the reflection of a Custodes in a roomba metal casing... so pretty solid source. And that guy told me that the Emperor is just fine, drinking tea with Macaldor and his psyker friends. And also all the loyal Primarchs who are just fine and dandy.
So Mr. Aurelian here should shut his heretic mouth.
In case there are readers unaware, after the Horus Heresy the Emperor was left catatonic and somewhat of a literal skeleton, so in order to keep his spiritual self alive within the Warp they sacrifice Psykers to him constantly.
Citizens are mostly kept in the dark about literally all of this.
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