@Override
	public boolean hasSymbol(Address addr) {
		try {
			if (adapter.hasSymbol(addr)) {
				return true;
			}
			return (addr.isMemoryAddress() && refManager.hasReferencesTo(addr));
		}
		catch (IOException e) {
			program.dbError(e);
		}
		return false;
	}
Removes the symbol directly

@param sym the symbol to remove.
@return true if the symbol was removed, false otherwise.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java