You seem to be implying some politically-motivated misrepresentation or classification of the data is occurring within the article, but the article only refers to the broad category of "mass shooting," which includes both terrorist events and criminal/gang shootings.
"With just over 19 weeks into the year, this averages out to about 10 such attacks a week," when referring to the Buffalo shooting.
Saying "10 such attacks" implies the attacks are all similar in characteristics beyond just the number of people involved. The article talks about mental health, it talks about a pre-planned desire to kill. But it doesn't talk about gang violence. These are very different sources of intent. If you want to use the gun violence archive data to make a point, it should be about gun violence in totality - not cherry picking their numbers to make the case that the US is full of hate-filled crazies who are randomly shooting places up 10x per week.
This isn't an argument anyone, much less the article, is actually making, it's a strawman.
Plus, mental health and a pre-planned desire to kill obviously correlate with gang violence. Bloods killing crips and white supremacists shooting up restaurants are not as separate in their intent or root cause as you seem to believe.