imo if anything is done about it, it shouldn't be storm nerf, it is one unique thing about the unit and should remain, it also isn't that strong, just move out of the way for 10 or so seconds that it is happening, it is also completely random anyways that whoever used it can't guarantee it will attack the proper target or even a hostile one (friendly fire is just as easy), it is more like a damage over time death nuke
I also thought that monkey dying used to cause an instant aoe damage and stun, but maybe that was only in steam FA or even original supcom