Solid enough, the owner admits their could have been/was a way found to effect online.
The problem here is the profits of Rockstar have never been effected by cheaters and OpenIV even if it was recently found out how with the program. You can look up the earnings for 2016 to see they reached a high of $700million from Shark Card/Game Sales. That is more than money than anyone can say, and it can fund three GTA V replica Titles.
You don't attack a program they you advertised for doing great work to keep the game alive. Rockstar tweets mods themselves and promoted OpenIV. Take-Two simply had to ask OpenIV to look at their program one last time and find out how fix the problem with the breach letting malicious things being used for Online considering it never could before. They already shut down three major hacksites for GTA Online that never used OpenIV.