Reading the article I personally find this bit slightly ominous:
So like, you can't just use an older species? I mean, obviously with a background, some adaptation would be necessary, but a species? That is a bit worrying. Why would they be "adapted"? Given how extremely inconsistently they were designed, I can't think of any guidelines that aren't going to cause a huge mess and really back 2014 further incompatible with 2024, despite previous claims.
I guess they idea is they've moved from stuff from the race/species design-space to the background design space, but it seem to me that the backwards-compatible and sensible approach would be "please use 2014 backgrounds with 2014 races", not "play around trying to adapt both when race/species were completely inconsistently designed in 2014".
Also there's kind of vibe that you're "not allowed" to use the 2014 rules to create new characters from this, which is seems new and weird.