I doubt it would be a total ban for all companies doing IPO overseas. Most probably the West is scaremongering.
However if this is true then that says to me that the CPC is gearing for protracted economic warfare against the West by shoring up its compehensive national strength. This means that China wants to become a strong financial center similar to the US and attracting funds from around the world.
Again, if what he is saying true, then the CPC is gearing for total confrontation on the economic front.
Westerners are going to lose it when they see how fast China makes decisions when under threat. Popcorn!