correlation doesnt mean causation.
the ones who uses blackberry would not be chads, not even normies. mostly are ugly nerds, coping by fringe-tech-maxxing, thinking blackberry is superior. they cant find superiority in other aspects of life so they resort to that.....
so ultimately its the looks. a chad using blackberry would probably add some points. for being unique, mysterious, he would get "wow what phone are you using, it looks so nice and unique!" from foids, and the foids would patiently listen to all his justifcation and expalnation of why he's using a shitty outdated phone of early 2000s tech.
the same applies to other fringe (or cringe?!) tech such as linux. you bet those muuuuuuuuhh linuxxxxxx open source guuuuud!!! crowds on average look like ugly soy cucks. does that mean a computer operating system bring down or up your SMV points? nope, since foids dont give a damn about what OS you use. its all looks. but if you use the same methodology like the study you mentioned, it would appear as if using linux bring down your SMV points. JFL.
actually, i'd say these can be the typical incel-in-denial, numale, soy-cuck traits: using blackberry, using linux, RGB-maxxxing their gigantic desktop pc with a side window on, the PC is put on the table to show off their muhhh powerful PC with custom water loops, colorful lights illustrating the entire interior, mechnical keyboard, gaming mouse again with RGB in it and tons of useless extra buttons, uses steam only and steam library full of obscure games you never heard of.