The try and conversion helped secure his side's 40-37 win.
Mr Aaifou-Olive filmed Mr Cox playing and put the footage on his Facebook page on Monday afternoon.
He wrote: Meet my mate Daniel Cox 24-years-old with autism. He is passionate about rugby but doesn't get many opportunities to play the game he loves...
"I don't really put a lot on Facebook, but thought that was pretty special," Mr Aaifou-Olive said.
As at 4pm yesterday it had over 236,000 views.
"It was pretty amazing, I guess it's the impact of DC really."
Mr Cox said playing in the match was "a real buzz" .
"I think I should have gotten a starting role."
He said the team was like a "second family", and was now waiting to for a call up from All Black coach Steve Hansen.
Meet my mate Daniel Cox 24 year old with Autism. He is passionate about rugby but doesn't get many opportunities to play the game he loves. So on the weekend our Bay of Plenty Samoa Rugby team made his dream come true wearing Bay colours for the first time.
Check him out and be inspired!
Posted by Ati Aaifou-Olive on Sunday, 11 September 2016
Head coach Tumanu Martin said the attention the team and Mr Cox had got was "surreal".
"I didn't think anything of it really, it's more, someone who is always there to train so we just put him on."
Assistant coach Mefiposeta Taele said Mr Cox "got stuck in and smashed a few boys" during his time on the field.
Mr Cox's mother Andrea Sinden said the try was the fulfilment of a life-long goal for her son.
His love for the sport started after he played his first game of rugby when he was 5 and almost scored a try.
"For the rest of his life he's been talking about, 'I just want to get on the field and I want to play rugby and I want to get a try'."
Mr Cox had been played for various clubs in the area for the past five years but up until September 10, had never scored a try.
"What it's done for his self-esteem . . . Making him feel like a part of the boys, a part of the team and he loves getting dressed up in his strips and being a team player," Ms Sinden said.
Bay of Plenty Samoa
The Bay of Plenty Samoan rugby team was established last year, as an official representative team for the region.
"It gives an opportunity for Samoan kids to play rep rugby also, DC as well," Mr Aaifou-Olive said.
Mr Taele said the team was about giving back to the community.