I've seen this kind of article in quite few of the sites where you also find crazy shoulder supersets as a 'do this programme' article.
The problem being that the 'Get massive delts in a month' article will get more attention than the 'Save your joints' article. The content is good, but people tend to want easy answers. When the stupid stuff fails them, they may come here.
I'd take issue with two things in the article. Good mornings aren't a bad thing if done according to the wise advice in Starting Strength, i.e don't go stupidly heavy and don't do them wrongly.
For my other objection I am prepared to face the mob of lifters with flaming torches and pitchforks who are likely to gather for a tar and feathering party.
Here goes. The leg extension machine can be a useful aid in knee rehab. Setting the machine for about 20 degrees of movement and using incremental loading it is possible to work up to a weight that is uncomfortable, but not unbearable. Two weeks of this regime doing about ten reps on the top sets got me from having trouble with the stairs (I basically had to walk up sideways) to being able to squat.
Now I squat. Before using the leg press in this way, I couldn't squat because the descent was too painfully distracting. People do still duck for cover at the sounds my knees create when I squat, but it doesn't hurt.