Doom Speed Demo Archive
https://dsdarchive.com/

Iwad:      DOOM2.WAD
Map:       MAP08
Skill:     4
Category:  UV Tyson
Exe:       dsda-doom 0.29.4 -complevel 2

Time:      3:50.69

Author:    Keykhosrau

Advanced HUD used
Video: https://youtu.be/8SnazULICK0

Comments:
Disclaimer: This is a tool-assisted speedrun!!!

I was thinking about how to minimise this run as it would be an eyesore on a D2ALL Tyson TAS to have to chainsaw everything, with its unacceptable damage given how many enemies there are and the potential for infighting. 
So, I made the Cyberdemon my Rocket Launcher Pet by having it teleport into the main area and rocket everything. I got 5 mins firstly (which was the same as it was to play a normal TAS) but then with route changes and to reduce monsters wondering off into the secondary area, the time was being cut off it after each iteration, like marble.
Finally, by moving the pinkie area to the end (which did not play nicely with monster herding) I achieved the sub-4 I was looking for, with 10 seconds to spare!!!

The question remains: can you do this non-TAS? Most definitely not, the amount of RNG to get the Cyber in the main hub without active maintenance alongside RNG to make it aggressive enough to kill stuff is not practical normally. I leaned on permanent sr50 here also to direct the rockets without dying.

Many thanks to the members of Hell on Earth Discord for their suggestions about the getting the Cyber to kill things.