I think the response "whatever that means" was more along the lines of "One Health is a very poorly defined concept that isn't marketed well".
Which is very true. It hasn't really caught on in terms of the human/population medicine side of things because of that, even though linking human and animal health is supposed to be a big part of it. . Vet students and vets may be familiar with the term because it's marketed to us and beaten into our heads, but I have yet to meet a MD, DO, resident, or medical student who has any clue what "One Health" is.