Narrated Ibrahim:
The companions of 'Abdullah (bin Mas'ud) came to Abi Darda', (and before they arrived at his home), he looked for them and found them. Then he asked them,: "Who among you can recite (Qur'an) as 'Abdullah recites it?" They replied, "All of us." He asked, "Who among you knows it by heart?" They pointed at 'Alqama. Then he asked Alqama. "How did you hear 'Abdullah bin Mas'ud reciting Surat Al-Lail (The Night)?" Alqama recited:
'By the male and the female.' Abu Ad-Darda said,
"I testify that I heard me Prophet reciting it likewise, but these people want me to recite it:--
'And by Him Who created male and female.' But by Allah, I will not follow them."
The red bold is talking about recitation, he said how did you hear it being said. You see that is why Usman RA standardized the text into one dialect so they would not bicker about little things like this, besides look at what they are talking about the change in pronunciation had no change on the meaning of the verse itself because the verse was the same but they were fighting over how to say it.
He does not need to prove authenticity for this hadith because it does not prove what he claims at all.