There is this statement about TTP 9 on the Micromat web site
Originally Posted By: Micromat
New Models and Sierra
Techtool Pro 9 is compatible with all current Macintosh models and system versions. When macOS 10.12 Sierra ships, a free downloadable update will be provided shortly after Apple makes this release available.
When I launcned TTP 9 (I am on my iPad so I don't know the exact TTP version) on MacOS 10.12.1 beta 2 I did not get the warning message. I suspect app developement has gotten ahead of web site updates.
If we knew what it was we were doing, it wouldn't be called research, would it?
I suspect app developement has gotten ahead of web site updates.