Except, they used SI units (mega, giga etc) then multiplied by 1024 implying IEC units.
Something that most people don’t tend to adhere to is SI units (MB, GB…) Are base 10, or a simple 1000 of each other. If you’re multiplying by 1024, you’re dealing with Mibibytes, Gibibytes etc, or MiB GiB etc in their short IEC form.