The article you link to claims: “In 2018 so far, mass shootings have resulted in 21 deaths, compared to 1,827 deaths from gun-related incidents, according to the Gun Violence Archive and Washington Post research.” If we go to the Gun Violence Archive we find that what it really says is 22 people have died in mass shootings so far in July of 2018. If you scroll back from the page just linked to, you’ll find that 194 individuals have died since January 1st so far. Nice try.