Custom EDID applied to all connectors?

So I installed a custom EDID to add a virtual monitor (following this guide: https://www.reddit.com/r/linux_gaming/comments/199ylqz/streaming_with_sunshine_from_virtual_screens) and the VM appears correctly. Great! The only caveat is that it seems the new EDID is being applied to my physical monitor as well?

The kernel arg is clearly pointing to a specific connector: drm.edid_firmware=HDMI-A-1:edid/samsung-q800t-hdmi2.1 while my physical monitor is on DP-1. Any idea?
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