The "verified" link you are seeing for umru — Sound Cache Vol 2 typically refers to the official release of the sample pack on Splice Sounds, which launched in February 2019.
Melodics: Experimental synth loops and one-shots designed for high-intensity tracks.
The Origins: umru (Estonian-American producer Umru Rothenberg) initially gained attention for his unique, "search engine optimized" sound design and a high-profile remix of Lido's "Citi Bike".
Verified WAV Cache Indicator
If not on Splice, check: