Is DB_FILE_MULTIBLOCK_READ_COUNT deprecated?

In our database we experience Wait Class Evente User I/O and most of our events are: index fast full scan, db file sequential read, I have read a way to avoid these events is unseating the parameter  DB_FILE_MULTIBLOCK_READ_COUNT because It's and deprecated parameter, but when we unset it and after re start the database  this parameter still set. but I can't find a official doc or paper that confirm this about the parameter.

how we try to unset this parameter:

SQL> alter system reset db_file_multiblock_read_count scope=spfile sid='*';
System altered.