It’s not installed in that application as an actual fire alarm system, and looking at the UL listings for that panel, it’s not listed for commercial fire alarms.
What you’re looking at is actually considered a sprinkler supervisory service, not a fire alarm system! The code gets confusing when you get into industrial/warehouse type facilities, often times a fire alarm isn’t required, especially if it’s a fully sprinkled building. What is required though is that the sprinkler system is monitored and this for some reason can be by any type of berg panel like a radionics. We’ve used bosch security panels, silent knights, etc. Where it gets really confusing, is I’ve had AHJ’s require a few horn strobes and smokes/heats on these systems too, but never like a full blown fire alarm system would require.
From the DMP XR-500 data sheet:
Underwriters Laboratories (UL) Listed
UL Bank, Safe and Vault
UL Standard Line Security
UL Encrypted Line Security
Looking at your photo, it’s also rare to see Halon still installed anywhere. We have a few sites with it still but for the most part they’ve been yanked out and replaced. They stopped producing the stuff in the mid 90s iirc.