Is the Republican Candidate in the 12/18 Special Election in Virginia HD-24 Not Legitimately on the Ballot?

Very interesting Twitter thread by Josh Stanfield of Activate Virginia, pertaining to the special election this Tuesday (12/18) in HD-24 between Democratic nominee Christian Worth and Republican nominee – or maybe not, legally speaking, according to to Stanfield and Ben Tribbett (see below)? – Ronnie Campbell? If Campbell is NOT legitimately on the ballot, would HD-24 Republicans be better off writing in Jimmy Ayers, who lost the nomination by just one vote and is not discouraging such a write-in effort, on Tuesday? Inquiring minds want to know…