It seems like they wanted to target multiple audiences.
Most of the theme park folk who were invited had young kids, with only a few exceptions. They didn't just invite the usual Universal crowd. Channels like Dev, Pugh Two, and Mr. Morrow weren't there, and even the Mammoth Club wasn't there in their typical capacity but attended as a +1. There were also Dallas/TX-area media/influencers getting previews before and after the main media preview, and they brought in some well-known family influencers with national reach.
No, not every Dallas outlet went, just like not every theme park outlet went. Looking at the invite list as a whole, it feels like they curated the list based on the audience they wanted to reach (families with young kids, regional family creators, and a handful of established Universal voices).
I also don't think Universal expected this level of backlash.