In "New Person, Same Old Mistakes" by Tame Impala, the "twinking" sound you hear is likely produced by a combination of synthesizers and effects. Tame Impala's frontman, Kevin Parker, often incorporates various electronic elements, including shimmering synths and reverb-drenched sounds, to create a rich and atmospheric soundscape. The specific "twinkling" effect is typically reminiscent of bell-like tones or higher-pitched synth melodies that add a dreamy quality to the track.
If you want to replicate that sound, you might want to experiment with synthesizers, using bell or plucked instrument presets, along with reverb and delay effects to achieve that ethereal quality.