Shaykh Abdul Qadir Jilani (rahimahullah) has mentioned the following Hadith in his book Al-Ghunyah
“Bismillahir Rahmanir Rahim was the first verse to be revealed upon Adam ‘alayhis salam and the ummah will be protected from punishment as long as they read it”
The Hadith appears in the source you have provided without a chain of narrators. I have not come across a chain of narrators and I am therefore unable to comment on the authenticity.
The Hadith should not be quoted until it can be verified.
(Al Ghunyah Li Talibi Tariqil Haq, vol. 1 pg. 218)
And Allah Ta’ala Knows best.
Answered by: Moulana Suhail Motala
Approved by: Moulana Muhammad Abasoomar
Checked by: Moulana Haroon Abasoomar