I think this is valid because the same government entity keeps these practices and policies onto the same victims. There is also a distinction to be made on the original event which we call The Nakba and the ongoing policies which followed. It is kind of like saying that the Korean War never ended. We have this original event, and then we have the aftermath which is still unresolved (not making a comparison though granting the right of return to displaced Palestinian is a million times less complicated than the Korean reunification).
I also hear people talking about the Gaza Genocide as a second Nakba. I also think this is valid (although The Gaza Genocide is a descriptive enough name IMO) since it mirrors the original event in scope and horrors, in policies. This would be akin to calling a second world war following The Great War World War II.
The Palestinian exodus from Kuwait, or the Syrian reign of terror against Palestinians are, however, not a direct followup or a continuation by the same entity of the same practices and policies of the original Nakba.
At most I can understand the use of the word Counter-Nakba as the Jewish hostile policies of e.g. Iraq were a direct response to the original Nakba. However the scale and horrors of that policy were nowhere near that of the original Nakba (even though the scale of the results [somewhat] did). And the practices and policies of Muslim majority countries did not mirror those of Israel during the Nakba, quite the contrary.