Though I agree with the issue of bodyweight exercise and general fitness etc prior to "specialising" with barbell work, there are also exceptions to the rule where it wouldn't work and those have to be considered.
Just as an example:
Mary McGregor only started Olympic lifting at the age of 55y/o having not done any prior exercise. At age 60 she broke all the american records, and world records in her category.
The exercise plan she was put on was tailored to her and had to be reduced for recovery etc.
And, as an extra funny, if 100 push-ups were needed prior to using weights, I'd have never bought a barbell, due to my TOS issues