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The objections you raised can be met easily enough. The second definition of 'restorationism', in the OED, is ""A House Church movement which seeks to restore the beliefs and practices of the early Christian church; the doctrine and principles of this movement."" I think it is easy enough to see from the reference that this describes the JWs. 
Things that are very easily referenced need not be, necessarily. If everyone is willing to accept them, cites are less necessary than for contentious statements.
The OED defines JW solely as the members, and not the religion; ergo, the primary use of ""Jehovah's Witness"" is of the members, not the religion: ""a member of a fundamentalist millenary sect, the Watchtower Bible and Tract Society, founded c1879 (under the name ‘International Bible Students’) by Charles Taze Russell (1852-1916), which rejects institutional religion and refuses to acknowledge the claims of the State when these are in conflict with the principles of the sect.""   "