لَيْسَ كُلُّ تَأَخُّرٍ ضَلَالًا.
Not every delay is a case of getting lost.
لَيْسَ شَيْءٌ مِنَ التَّأَخُّرِ ضَلَالًا.
No delay whatsoever is a case of getting lost.
The first denies a universal equation: some delays occur without loss of direction. The second excludes that description from *every* delay, a much stronger and unjustified claim. Altering the scope of negation alters what can be inferred.
One caravan's safe delay must not become an unsupported generalization about all travelers.