The story of a Sahaabi who could not recite the kalimah at the time of death

Q: I would like to ask Mufti Saheb regarding this story. What is the status of this story? Can we use it for targheeb and tarheeb?

 There is a story narrated in the hadith that there was a youngster in the time of Rasulullah (sallallahu alaihi wasallam) who was in his dying moments. It was told to Rasulullah (sallallahu alaihi wasallam) that this youngster cannot recite the Kalimah Tayyibah. Rasulullah (sallallahu alaihi wasallam) came to him and asked as to what the problem was. He said, “O Rasul of Allah, there is something like a lock upon my heart.” When they enquired on his condition, it was found that his mother was displeased with him. 

Rasulullah (sallallahu alaihi wasallam) called for his mother and said to her that if someone had to light a huge fire and wants to throw her son into it, will you intercede on his behalf? She said, “Yes, O Rasul of Allah, I will.” Rasulullah (sallallahu alaihi wasallam) said, "If this is so, then forgive his mistake." She forgave all that he did. He was then told to recite the Kalimah Tayyibah, which he immediately did. Rasulullah (sallallahu alaihi wasallam) thanked Allah Ta’ala that through him a person was saved from the fire.