Yes, the Delkin Devices PRIME SD V60 128GB is compatible with the Nikon Z8.
Nikon Z8 Slot 2 accepts SD UHS-II. Delkin PRIME SD is Video Speed Class V60 (280 MB/s read / 105 MB/s write rated) -- meets the Z8's ~45 MB/s standard SD floor but not its 250 MB/s literal minimum for high frame size/rate video modes per Nikon's own manual. N-RAW and ProRes RAW HQ are CFexpress Type B only and unaffected.
Limitation
Does not meet Nikon Z8's high-frame-size/rate SD modes (requires 250 MB/s literal sustained write per Nikon's manual) -- this card's real sustained write is 105 MB/s. Works for standard SD-slot modes and all CFexpress Type B modes (unaffected, separate slot).
“are recommended for recording and playback of videos with a high frame size or rate”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)