GDP and monetary pumping

In an age where "the GDP" is usually considered the all-important parameter to measure the "health" of an economy, the following should be kept in mind:

Remember that changes in GDP are a reflection of changes in monetary pumping: the more is pumped the greater the rate of growth of GDP. (#)

Therefore, it is sad to see robust and solid companies base their forecasts on forecasts on GDP. This is pure guess-work. An increase in GDP is more often than not harmful. A lowering GDP could even be a surer sign of an improving health of an ecomony, as monetary contraction is in many ways a cleaning process rather than the other way around.