No, its disingenuous to include suicides...since of course suicide is by the far the most common cause of gun-related death. So that's proper, at least. Suicides are 2/3 of all deaths via firearms iirc...creates a ridiculously inaccurate death toll as opposed to gun violence to include those numbers. Which is of course why most of the time they like to include suicides. Makes it look 3 times worse.
I'm assuming the weird time frame is just a matter of lack of decent data from international sources. The whole graphic is just kinda useless.