Specifically, under a list of their work as a programmer at Rockstar, this person lists "Red Dead Redemption 2 - PS4/XBox1 [sic] /PC". This is not exactly an open secret knowing the history of Rockstar Games, but they haven't announced any plans for a PC version officially so far. Though he no longer works for Rockstar, his credited work with the studio notably included the following credit, which reads "Red Dead Redemption2 [sic] (PS4, XB1, PC)".
Ever since that October release, there have been murmurs of a PC release eventually being used a follow-up - after all, it happened with Grand Theft Auto V. The first Red Dead Redemption never made it to PC but the sequel is more of a prequel that is set before the events in the first game. Over on the US PlayStation Store, Rockstar has released a whopping 27 Red Dead Redemption 2 avatars for free. This makes GTA V Rockstars best-selling game as its outperformed even classic GTA titles.
That entry is gone now, likely because PC Gamer picked up the story.
According to a report from PC Gamer, the LinkedIn credit in question - which has since been removed - belonged to physics programmer Nan Ma.
Rockstar did opt to port GTA V over to PC in April of 2015, nearly two years after the initial console release, and six months after the next-gen re-release for Xbox One and PlayStation 4.