He was past at it then also in my opinion. That doesn't mean he is not capable of winning matches.
His last great team was Inter in 2010, but not just in terms of winning. They dominated matches, controlled the game, did with and without the ball what they wanted.
Around that time football changed, Guardiola came in full force with tiki taka and Klopp with gegenpressing and they influenced the game around the globe. He couldn't or didn't know how to adapt. His football became more and more reductive counter attacking style with lots of off the pitch issues. It's not just that he parks the bus, he did that before. But in his prime years 2004-2010 when he did that he had control, oponent was limited and couldn't create shit. He lost that, that cohesion and mentality that his Porto, Chelsea first time and Inter had, he couldn't replicate anymore.