Yes, the Elgato Game Capture 4K S is compatible with the Nintendo Switch 2.
4K S is explicitly marketed by Elgato as 'Best for Switch 2' and listed first in its own recommended console list. Switch 2's docked output (max 4K at 60fps) is within 4K S's HDMI 2.0 passthrough/capture range, and Nintendo does not enable HDCP by default on Switch consoles per Elgato's own HDCP article.
“Best for Switch 2 Stream and record your Nintendo Switch 2 gameplay in unmatched clarity.”
Last verified:
Confidence: high confidence