I was going through an update to our system. I did not see any note to the processor being deprecated but did see the note in migration guide for properties on Avro processors.
There is no reference in the current documentation to processor ConvertCSVToAvro and it is not in the build for 1.10.0. Not sure if this was removed for some reason or just missed but it was a processor I have in use from build 1.9.2.
I assume either the build needs to be fixed and or the documentation and migration guide updated.