These are knockout mice where they have changed the CMAH gene to mirror how it is in humans. Of course there is no 1-to-1 correlation, but we can hypothesize about why the dietary change works now that we have an idea of the underlying mechanism.
If you fed a human a mouse diet would you then conclude that it’s not healthy for mice because of what it did to humans?
I’m sorry, this is just completely illogical.