Downsides compared to using other methods? Sure. It's not as consistent, and this one looked easy to fuckup. As it hits a small ledge twice before getting to its spot there's the potential you aim slightly off and miss it. Also likely because it's a bit awkward to lineup.

/u/DrakePHOSE shared a smoke that the majority of top teams have been using.

"A far far far easier and more lenient 128 smoke.

Get in the corner, aim at the top right square of the door (and as seen in the gif, it isn't to specific where in the square), and hold right + hit your jump throw bind. You don't even need to hold right for that long." -DrakePHOSE

The smoke is more consistent, easy to lineup, and gets there faster.