This despite the shows (Bzzz, Temptation, Celebrity Name Game) being newer and fresher than Buzzr's other offerings.
Temptation was a ratings disaster in it's original run, never cracking a 1.0 as far as I can recall. Despite that, on Buzzr it ran for close to a year at 7:30pm ET (Concentration '76s current slot) in 2019. (Edit: 1/14/19 to 9/27/19) - It's Buzzr run has honestly probably been more successful than it's syndication run.
Bzzz only did a year in first run as well although reruns kept going for a few years in late night, and clearly didn't have nostalgia beyond a short burst, while Celebrity Name Game has zero nostalgia factor and wasn't ever THAT great of a performer in many cities - honestly, outside of about a dozen stalwarts first run syndication has been a dying market for years
Also: Because Fremantle owns the channel, the base of content they have to work from without having a format shift is going to pretty heavily restrict them to shows from Pre-1995 in general anyway. The pool of stuff post-Goodson is honestly quite shallow. (Although honestly I'm kind of hoping to see the 2002 Beat the Clock revival turn up at some point and honestly? I think Match Game '98 is worth a revisit)