If you agree to the statement that any accountant which uses Excel formulas to do bookkeeping is also a software developer, then yes, you and OP are correct.
> If you agree to the statement that any accountant which uses Excel formulas to do bookkeeping is also a software developer
They are as much a software developer as they are a writer because they write e-mails; a presenter because they present the annual accounts to the CFO; and a cleaner because they put away their mugs at the end of the day (usually.. hopefully..)
You don’t have to be someone because you sometimes do something that other person also does.