Nonsense.
Perhaps, but DDE was a fair President at best. He was extraordinarily fortunate to become President when all the planets aligned and ALL was right with the US.
He inherited a robust post war economy at a time when the vast majority of Americans were fat and happy. The middle class was exploding, industry was at it’s zenith and trade unions had not exploited their power as they would do into the 60’s and beyond.
The 50’s were arguably the single best decade this country has ever experienced and it had actually very little to do with who was President at the time.