Not just you, but let's Occam's Razor this. Nothing else is identified on the map by a "codename." The term "Seek & Destroy" is a Metallica album, and easily/primarily recognized as such. Why not use the more generic "search & destroy" to avoid confusion, and indeed a possible lawsuit? (Metallica famous for being litigious.) Also, why potentially burn a bridge like that?
Aside from that, a single artist was featured in 2019, another would have been in 2020. Metallica was previously rumored to be in discussions with HHN LA. The band name is a bigger IP than Shudder, Creepshow and possibly even Hill House. All circumstantial evidence, but it starts to point to a narrative.
What single piece of evidence points to this not being a Metallica zone?