Last numbers I know (12/2022) are 4% wild, 96% humans and livestock. Not trying to pedantic but if you have another source than this one can you share it ? Those numbers are so close that they seems to consolidate each others.
The 97%-3% numbers came from the top of my head from an article I read some years ago (so slightly outdated) and obviously these kinds of estimates have a significant error bar, but also the ourworldindata page you link to talks about something slightly different; they talk about all mammals, which includes marine mammals but excludes other vertebrates, like birds and reptiles. My numbers were, at the time, cited (as I stated) as "terrestrial vertebrate biomass", which would exclude marine mammals but include birds and reptiles. I think all birds would be considered terrestrial vertebrates because even penguins have to come on land to breed.