This is a strange comment because not only is academic philosophy built from the Greek tradition, but it is formalized. Maybe one can say it stagnated for centuries but I find it difficult to say that the work in the 20th century is inferior.
I wouldn't say that about comparing Hilbert to Pythagoras, and this is not putting down history of knowledge.
Just the awareness of the scientific method makes us far superior to the ancient Greeks. Many still doesn't follow it, but basically no Greek followed it and it really shows in their works.
For problems where the scientific method doesn't help however we probably aren't that much better than the ancient Greeks, maybe we are even inferior there.
For things where the scientific process doesn't help we have no objective way to conclude anything. Thus debates about topics like Abortion or Gun control where different rights and belief system exist in conflict with each other. Typically neither side will acknowledge the others position as having any validity, but if you can find someone in a different tradition that supports (or seems to support) your position you will say they are authoritative despite there being no objective fact in the first place.
I wouldn't say that about comparing Hilbert to Pythagoras, and this is not putting down history of knowledge.