First you think and imagine
(philosophy)
I'd suggest that's not a good characterisation of philosophy, because according to that characterisation, everybody is a philosopher and doing philosophy all the time.
That definition is not specific enough to do the question discussed in the article justice.
The article defends (whether successful or not I'll leave open) philosophy against the common charge of not having progressed much recently, Whitehead's famous The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato being perhaps the most popular form this criticism takes (whether that does Whitehead justice is another question I'd like to leave open here).
Here is a definition of philosophy that is much closer to the concept of philosophy the article defends: philosophy is what academics who work in philosophy departments do.
philosophy leads to science
I make a strong counterclaim:
all progress in philosophy comes from progress in the hard sciences. As examples for my claim I put forward: quantum mechanics, general relativity, non-euclidean geometry, set theory and type theory as foundations of mathematics, Goede's incompleteness theorems, theory of (economic) games (leading to the first substantial progress in moral philosophy since Kant), AI/ML.