That does not affect the Rift Generators Dymensional Desync Ability, unfortunately.
At least Dimensional Instability could be resisted and needed many levels to have a measurebale effect, so it was not utterly broken. With that change, if anything DI is a meh-ish debuff. It had low chances, you need many stacks, it can be easily cleansed.
You kinda alredy have use "Psionic Debuffs" as a kind that is hard to cleanse. There is a whole lot of cleanes/heals with cleanse that only affect "non-psionic" debuffs.
Maybe you could add Void (relating to space time effects around the unit) as a even higher level of cleanse?