Apparently HDMI 2.1 which specification is from November 2017 can do it. My TV itself is even older than that, and a dumb TV doesn't need to be upgraded often.

Apparently HDMI 2.1 which specification is from November 2017 can do it. My TV itself is even older than that, and a dumb TV doesn't need to be upgraded often. That's part of the purpose of a dumb TV; longevity. My MBPs from 2015 also don't support it, and Apple only recently released a decent replacement for these MBPs (given the keyboard issues in previous). My old monitor from ~2014, a BenQ, also does not support it. While I recently replaced it, it still works perfectly fine (it doesn't have FreeSync though), and achieves 144 Hz over DP.