What part of this is untrue?
Players moving on could be considered to be wrong but at the same time some players have moved on.
I don't think there's necessarily anything untrue about that paragraph when viewed out of context. However, in the context of the article, sports/games that have "expired", it definitely doesn't read the same way. That paragraph is her support for the notion that disc golf, like pedestrianism and jai alai, is a passe sport/game that no one plays anymore. We know that's not true.
Either that, or she's trying to imply that these games/activities were once wildly popular but are now not so popular. But none of those listed, except maybe rollerblading, were ever at such a highly popular level that their current state could be considered non-existent by comparison.
Yes, there are plenty of people who used to disc golf but don't anymore, but I don't think it's the kind of thing where if you mentioned disc golf to a random person, their response would be "people still do that?" It probably would be "what's that?"