The IRA custodian is wrong. Because you are using the January 2023 withdrawal to count as your 2022 RMD, you must take another withdrawal to count as your 2023 RMD.
(however, note that the RMD is the minimum you must withdraw over the course of the year, it is not a single special transaction. If the total of the 2022 and 2023 RMD‘s are $33,000, but you happen to have withdrawn $50,000 because you wanted to buy a new electric car, then you have already met the RMD requirement for both years.)
