DPER are the ultimate providers of oversight when it comes to public procurement.You've got your head in the sand. Otherwise, please explain why the project executive decided to put the project to tender when the design was nowhere near complete? Why would they do that? Why also would the government not have a review process in place at particular milestones of the project, such as the point when it went out to tender? Proper oversight would demand this.
The responses of DPER at the Oireachtas Committee are very clear.
I suggest you watch the video rather than just reading the transcripts.