Your bug report

#70901: 30.0.50; Tramp doesn't use ControlMaster even with (setq tramp-use-connection-share nil)

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 70901@debbugs.gnu.org.

-- 
70901: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70901
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems