IOx is the data storage layer. It will replace the current TSM data storage system in InfluxDB, but it won't replace InfluxDB as a whole.
Some constructive criticism around naming... You don't have to have Flux in every single damn thing you create!
InfluxDB IOx is not replacing InfluxDB v2 because... It's just a new storage engine.
For querying we have Flux or InfluxQL...