PS4 version of the game running on PS5. This is the Paid DLC

Apologies for the audio, will fix it for later runs or if i re-record this

You can completely skip the west side reinforcement arrival if you defeat all other officers before reaching Zhong Hui BUT i have not been able to consistently make that work.

Also the ledges in this stage are barely filled, i'm sure you can horse clip through them without much trouble