#33453 undeprecated the datacarrier settings, but https://github.com/bitcoin/bitcoin/blob/v30.0/src/qt/bitcoinstrings.cpp#L165 still says:
QT_TRANSLATE_NOOP("bitcoin-core", "Options '-datacarrier' or '-datacarriersize' are set but are marked as deprecated. They will be removed in a future version."),
Best to remove that too?