There's so much wrong with that statement that I don't know where to begin. There's a principle that every Principles of Economics student learns two days after getting the syllabus: "moral hazard." Basically, the principle states that individuals and organizations act differently when they're insulated from risk. If you're insulated from risk by the government, what's stopping you from making stupid, risky decisions? Without the risk or possibility of collapse, there's no reason for companies not to screw around and gamble with their decision.
Actually that's probably at least partially the point.
Consider that the government - throughout history, but to an unusually greater degree very recently - has created an environment in which it is stupid, risky, and reckless to increase payrolls in any meaningful way. There are specific laws now on the books, for example, that could swing the cost of employing someone by tens or hundreds of percent in either direction, depending on implementation details that are left mainly to individual bureaucrats at their personal discretion. Given these facts, expanding payrolls for most employers would not only be unwise, but potentially actionable (corporate executives have legally binding responsibilities to their shareholders).
The natural (and since it was widely predicted, I think it's fair to say predictable) result is "stubbornly" (as if they've been trying their best to bring it down but it just won't listen) high unemployment, even in the face of slow to moderate economic growth. And politically, high unemployment is
always bad for the party in power.
So the point of federal stimulus in general, including but by no means limited to FL and other rail projects, is to try to coax companies into doing something that they otherwise would not - because they should not - do, which is to hire people. In other words, it's the intentional introduction of moral hazard.
Now, there is at least a case to be made in favor of this when (a) the federal government can afford it, and (b) the need is caused by factors which are cyclical, temporary, or due to a problem which has been or is in the process of being fixed - in other words where stimulus can stop something bad from happening short term, and will eventually become unnecessary due to the natural and expected actions of the market. Stimulus is inefficient, but sometimes preferable to the alternative, and therefore acceptable in the short term.
The big problem here is that in this case, the dip is the direct result of intentional changes to the economy that those in political power show no signs of
wanting to fix, let alone fixing. So under these conditions, stimulus at best delays the inevitable.