The Celeron J4125 may be getting a bit old, but its low power requirements can allow for both a slimmer chassis profile and fanless design to be attractive for HTPC users. Unfortunately, performance isn't where we would like it to be even for undemanding HTPC loads.
https://www.notebookcheck.net/GMK-NucBox-3-review-Fanless-Windows-11-HTPC.598623.0.html