hehe... its ok if you do wish to keep things closed... no problem it is your right to remain silent since your work is based on closed source code...
Food for thought:
Just to let you in on something... there are real engineers out there who patch well known vulnerabilities and actually disclose how they work... and the reason even after disclosed MUCH more than simple "hints" those will no longer be exploitable is because they actually got fixed and there is no harm in revealing the FULL details anyway...
Just one of the many examples can be found in the link below:
(feel free to get as much hint as you want in that publicly available white paper).
https://spectreattack.com/spectre.pdf