Flake tools used over 3 million years ago

https://www.cbsnews.com/news/researchers-find-ancient-tools-kenya/
These tools were made by breaking the rock to produce thin slices with sharp edges.  The claim that they are over 3 million years old would have them predate the pebble tool technology where small rocks were worked to have one sharp end and the other end that could be held. Pebble tool finds have been dated to up to around 3 million years ago. they claim the flakes as part of the Oldawan tool kit, but they would be the oldest oldawan tools by around half a million years.  I think that pebble tools are often grouped into the oldawan tool kit, but I haven't kept up on it.
The surprise is that a paranthropus tooth was found with the tools. They claim that paranthropus was the tool maker.  Paranthropus was a more ape-like robust australopithecine that had large teeth for food processing.
Wouldn't it be more likely that the tools were used to butcher paranthropus since his tooth was found there?
I did a search and last year Plummer published on oldowan tools and paranthropus teeth not as old as these, but it may be a redating of last years finds.
https://www.science.org/doi/10.1126/science.abo7452
Ron Okimoto