Here’s that use of the term “humans” to mean anything.
At 780kya , whatever it was using that tool was NOT our species.
So let’s talk about what ancient Homo sapiens ate:
“Early Americans ate tons of mammoth, 13,000-year-old bones from Clovis culture baby reveal”-https://www.livescience.com/archaeology/early-americans-ate-tons-of-mammoth-13-000-year-old-bones-from-clovis-culture-baby-reveal
“Neanderthals diet: 80% meat, 20% vegetables” - https://www.sciencedaily.com/releases/2016/03/160314091128.htm
“Homo sapiens 100,000 years earlier: Ancestors’ diet of game revealed” - New fossil finds from Morocco do more than push back the origins of our species by 100,000 years. They also reveal what was on the menu for our oldest-known Homo sapiens ancestors 300,000 years ago: Plenty of gazelle.
https://www.sciencedaily.com/releases/2017/06/170607133246.htm
The earliest human writing said:
“If it moves slow eat it.
If it moves fast tax it.”
Lol.