Zimbabwe was very different: the amount of money people had was devalued by new notes being printed that had extra zeroes before the decimal point.
Adding extra zeroes after the decimal point for money already in circulation leaves the total supply the 'same' but could also be viewed as increasing supply 10-fold, without disadvantaging anyone currently holding the currency.
Its never happened before, so I'm not sure many economists have thought about it
Changing denominators has an effect on the liquidity of small transactions, but it's not going to change inflation.
What inflation does in an economic sense is much bigger - it changes who has relatively more or less wealth or debt over time. If you take out a loan for $10,000 and inflation makes both your prices and wages go up 2x, then you now have half as much debt.
Deflation does the opposite and makes debt more and more expensive. This is why most economists are against it - debts that grow more expensive will trap people. Historically, debts were forgiven by decree (a jubilee) because the system kept breaking.
To me this is one of the most interesting things about Bitcoin. It is an asset based currency. In a debt based fractional reserve dollar economy you or someone else owes that currency back with interest. The economy is like a game of musical chairs. If a society was based on something like Bitcoin everyone could have assets, there wouldn't be as a strong need to borrow as there is today.
If Bitcoin was a predominant part of an economy borrowing a loan in it could be very bad. In a predominantly Bitcoin based economy everyone could have abundant wealth and there would be no need to be a debt slave.
Adding extra zeroes after the decimal point for money already in circulation leaves the total supply the 'same' but could also be viewed as increasing supply 10-fold, without disadvantaging anyone currently holding the currency.
Its never happened before, so I'm not sure many economists have thought about it