[Someone]

Yes, Latin centum means 100; hence century, and the prefix centi was invented during the French Revolution, meaning 1/100 (https://en.wikipedia.org/wiki/Centi-). For hecto-, they took inspiration from the free ἑκατόν (https://en.wikipedia.org/wiki/Hecto-)

(They did the same for 1000 and 1/1000, deriving milli from Latin millum and kilo from Greek χίλιοι, but used Latin for both deca- and deci-, and used Greek for both giga- and micro. So far for consistency)

I don’t see how it follows that either usage is acceptable.