You are reading a tafsir for the group of verses 71:24 to 71:26
وقد اضلوا كثيرا ولا تزد الظالمين الا ضلالا ٢٤ مما خطيياتهم اغرقوا فادخلوا نارا فلم يجدوا لهم من دون الله انصارا ٢٥ وقال نوح رب لا تذر على الارض من الكافرين ديارا ٢٦
وَقَدْ أَضَلُّوا۟ كَثِيرًۭا ۖ وَلَا تَزِدِ ٱلظَّـٰلِمِينَ إِلَّا ضَلَـٰلًۭا ٢٤ مِّمَّا خَطِيٓـَٔـٰتِهِمْ أُغْرِقُوا۟ فَأُدْخِلُوا۟ نَارًۭا فَلَمْ يَجِدُوا۟ لَهُم مِّن دُونِ ٱللَّهِ أَنصَارًۭا ٢٥ وَقَالَ نُوحٌۭ رَّبِّ لَا تَذَرْ عَلَى ٱلْأَرْضِ مِنَ ٱلْكَـٰفِرِينَ دَيَّارًا ٢٦
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3

It appears from Noah’s prayer that, in his own times, evil had reached its final limit. Misguided beliefs and thoughts had become so prevalent in society that any child born and brought up in this society would have gone astray. When this stage had been reached, Noah’s people were destined to face nothing less than destruction by Noah’s flood.