I never claimed damage to the tissues of the spine is the sole and only cause of back pain, I only said that if you do have damage to the tissues of the spine w

I never claimed damage to the tissues of the spine is the sole and only cause of back pain, I only said that if you do have damage to the tissues of the spine which is not uncommon you clearly risk making it worse by putting your tissues under huge forces - it is clearly not a health beneficial thing whether it happens to cause pain at the moment or not. It would be strange if having the strength to lift twice your bodyweight or more would somehow be necessary for a healthy back. There are safer ways of increasing strength of the weakened muscles, but first it would be good to identify whether indeed weakened muscles are the cause of one of the causes of your problem. That's all I am saying - deadlifting is not in general a safe recommendation for undiagnosed people with back issues.