Thanks to reader John for sending along Boston 2024's freshly released document which clearly states The Country Club as the golf venue should the sport still be in the Games and Boston lands the bid.
The details include how spectators would arrive at the course and suggests the club is "supportive of the proposed use" and "preliminary discussions with Trustees have confirmed venue availability."
The golf portion of the document specifying TCC as the one and only golf host and not, as noted in early reports, Franklin Park's William J. Devine GC. Golfweek's Jim McCabe scolds early reports for not accurately specifying the William Devine name and reports that TPC Boston is one of the proposed golf sites in the bid documents, though I was unable to find the mention.
Here is the golf bid page and the outlined vision for TCC as the venue, assuming this even gets to the bid stage. Based on the reaction in Boston, the possibility of a bid is no certainty.