No one was ever charged in relation to the allegations - despite the police investigation and an exhaustive review - due to a lack of evidence.
A song called trophies, shared on Parker's Youtube channel in December, details that the group planned to share videos in order to make an online career from the social media buzz around them.
"Our buzz was popping off and s*** was looking kind of great even though to maintain it we had to be a certain way. But that's ok, cause I had something in the works on my brain we'll make a video and broadcast it for all to be seen.
"Cause everybody already thinks we are crack up around here, so imagine if we take this thing for the whole world to hear, we'll be legends around the streets, man I swear, and we could turn that buzz into an online career," Parker says in the song.
Towards the end of the song Parker said moving to Los Angeles and attending church saved his life, "running from a past he couldn't face".
In a Patreon introductory video he talks about mistakes he made as a teenager.
"As a teenager I made some decisions that I thought would be able to catapult me into a career doing the things that I loved but all it did was show me the people I hurt and left me with a stain on my reputation that'll be there for life."
Two days after the video was uploaded, Newshub aired an exclusive interview with Parker who said he hoped people would see he had changed since roast busters.
The 23-year-old told Newshub he was speaking out in an attempt to "make amends" for the actions of the group and since the event had changed "mentally and spiritually".
DO YOU NEED HELP?
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone call the Safe to Talk confidential crisis helpline on: ll 0800 044 334 or text 4334
Help Auckland can be called 24/7 on 09 623 1700 and if you're asked to leave a message do so and an operator will be in touch soon.
Alternatively, contact your local police station - click here for a list.
If you have been abused, remember it's not your fault.