I think he makes some good points in the video, notwithstanding the negative Nancy comments above, but let me be the first to say that medium rare is too done. A waste of tasty cow meat. Throw away your Linus safety blankets and try it about 5° less done. 10°, if you're truly brave, or have enough gin & tonics in you before you cook.
More learning here:
Science of Slow Cooking