Yep, oldschool offset stretching is great for that metallic grainy feel.
Used to make a few patterns at the start of a song specifically to make these kind of sounds, make a selection in the pattern editor and render the sound to a new sample instrument. Through automating the speed with pattern commands or the bpm/lpb envelopes in the master channel you can also do nice tricks, gradually slowing down or speeding up the triggered offsets, variate pitch and pan positions for even more granular vibes.
Once made a tool suggestion thread for easy setting up such offset stretching, maybe more relevant now that we have phrases? ;
https://forum.renoise.com/t/idea-easy-oldschool-sampleoffset-timestretch-tool/34899