User would like to decommission VLCR from sddc with keeping VC, ESXi, etc
VLCR 7.27.5
As long as you are ONLY "Detach recovery SDDC" it should not delete anything on the Recovery SDDC as it is only detached from VLCR and does not touch any configurations related to HCX or VLSR (SRM).
Once it's done, you can deactivate the VLCR region from VLR tile.