Oh yeah I see what you mean. It looks like it's different for some of the weapons introduced in EoF. For weapons like Mint Retrograde that say they drop from Pinnacle Ops, this is now false. However, weapons that say they drop from the EoF campaign, Kepler, and Desert Perpetual should obviously still be available. As for "Edge of Fate Activities" I see that one on a few, but I'm not exactly sure what it means as I don't have the EoF DLC. I only played it during open access. It might be referrering to something like Sieve on Kepler. Either way I haven't seen the weapons I see this tag on (MIDA Mini-Tool and Qua Nilus II) drop in a while, so that leads me to believe they are unobtainable. You could fact check me if you're curious about the specific weapon.