I don't know. The 6 finalists that we know about were all white males but we can only speculate who she interviewed to get down to those 6 finalists.
While it's always a reasonable guess that a white male's identity played a role in their hiring process, we don't seem to have any evidence to support it.
Calling someone a "DEI hire" doesn't just mean that they're a different race than other people in an organization. It's used to imply that the person is otherwise unqualified for the job and was specifically hired to fill a diversity requirement.
I don't think that's an accurate description of Walz and I'd do some pretty serious eye rolling if MAGA starts trying to portray him as such.
He was clearly chosen for the votes he's likely to bring in. That's smart strategy on Harris' part.
As near as I can tell "the media" spent a few days wildly guessing about who her VP pick would be and many of them where white males. There are many articles that predicted that she would pick a white male but I couldn't find any that argued that it should be a consideration.