Conservatives usually use the phrase "at best, the impact is nil"
Liberals usually use the phrase "at worst, the impact is nil"
Because the study shows there is negligible impact. Every laborer is also a spender. If the person saves, then every laborer is also an investor.
If you believe in the mainstream economic theory, more jobs are produced for the ones that are "taken."
You might ask where are those jobs, and then people will say they are in new fields and require training etc.
The debate goes on: why aren't tech jobs in short supply? A: They are. Q: I don't see that, where? A: there isn't one "tech", there are many different fields and they are in short supply in the important ones etc.
It is not as straightforward as you make it out to be.