This summary sucks. TLDR: A Baltimore journalist noticed unfamiliar X accounts posting sus stuff about the bridge.
Here's the most important paragraph in the article:
Snowden (a Baltimore journalist) was up during the early morning hours when the bridge collapsed. Baltimore’s X presence is small enough that journalists like her generally know who the other journalists are working in the city, especially those reporting on Baltimore itself. Almost as soon as news broke about the bridge, though, she saw accounts she’d never heard of before speaking with authority about what had happened, sharing unsourced video, and speculating about the cause.
Over the next several hours, the misinformation and racism about Baltimore snowballed on X. For Snowden, this felt a bit like an invasion into a community that had so far survived the slow death of what was once Twitter by simply staying out of the spotlight.