HOAT coolant instead of OAT

I have fully drained the engine and inverter coolant , but I have accidentally filled with HOAT or so called G12++ fluid instead of an OAT one.
Now I found out that the prius does not like the silicate present in HOAT.

I have driven 2 years with it without troubles, but I would like to correct this now.

Question: Can I just drain the wrong fluid and fill up with the proper one or do I have to perform a flush?