As feedback, IMO, the last sentence in the article needs far more emphasis given how often the start position is incorrect.
"If you have issues with leading with the hips (assuming you are in the correct starting position)..."
At the start of the deadlift the lifter is taught to initiate the pull by extending the knees – “cued” to push the floor away. This elicits a strong contraction of the quadriceps which, assuming efficient force transfer through the kinetic chain, results in the barbell leaving the floor.
Read article
As feedback, IMO, the last sentence in the article needs far more emphasis given how often the start position is incorrect.
"If you have issues with leading with the hips (assuming you are in the correct starting position)..."
Fixing and teaching the start position is in different articles, videos, book etc. This is article is about a different problem.