Ridiculous!
Why on Earth would they hide that Russell was a Mason?
You can find public information on 14 US presidents who were freemasons, you can find public information on Joseph Smith that he was a freemason, you can find public information that at one point William Miller was a freemason.
Public info that C.T. Russell was a Mason?
Zero.
Why would they publicly and openly admit and not only admit but celebrate that U.S. presidents were freemasons, but have absolutely no information on the books about C.T. Russell?
The proof of membership is in the Lodge records, and there have been no lodge records found of C.T. Russell being a member.