"John Maynard's thinking is still valid."

Which demands running surpluses during the peak of the economic cycle 

"The key element in the equation id the debt-to-gdp ratio and that continues to improve."

That is only part of the equation, and  Keynes himself argued against precisely the action  the current Government is taking. 

His argument was that the Government's action is highly inefficient since you are paying a premium to buy growth forward - giving up 1% of future growth for 0.5% growth today, and that premium increases as Government spending increases (Law of Diminishing returns). Government spending is above the point Keynes argued that further spending becomes ineffective.

Keynes would be rolling in his grave at the way the current Government is abusing his thinking