Salam alaikum
This verse was in relation that Allah the Almighty was telling the Prophet (peace be upon him) not to make Istighfar for the hypocrites. Using the number 70 is an Arabic practice that refers to exaggeration in number not just 70. That means even if you make Istighfar for the hypocrites so many times 70 or more, God had already known their status of hypocrisy and will not forgive them.
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Views expressed by hosts/guests on this program (live dialogue, Facebook sessions, etc.) are their own and their appearance on the program does not imply an endorsement of them or any entity they represent.