2. Calculating simple correlations like this for any policy action (stimulus, tax cuts, spendings cuts etc) with GDP changes is problematic due to the fact that certain policies are tend to be exercised in certain economic circumstances. Tax cuts and stimulus are usually used when the economy is weak to boost the economy, which might mislead people to think that the cuts and stimulus are the cause of the weak economy as they occur more often during low GDP growth periods.
The reason no one cares is because this report could've been constructed by a first year undergraduate. How anyone here thinks you should draw any conclusions from it is beyond me.