The first professional commercial 4K camera came out over 23 years ago, and the first smartphones and camcorders capable of 4K video were back in 2013.
The Macbook Neo has a 2.5x higher multi-core Geekbench score compared to the i7-4960X's, the top consumer CPU of 2013 (which could handle 4K video editing in h264), and its single-core performance is 5x higher. Plus, I'm 99% sure the MacBook Neo has a dedicated video decoding ASIC anyway.