[OKX has no mixer service, OKX allows an account to generate multiple deposit addresses. If you find that the funds for each address they provide are only sent to the OKX hot wallet, it is confirmed to be generated from the same OKX account belonging to the one scammer, there is no need for further investigation.
Please excuse me, but my English is not perfect
. Does it mean that the address I was sending money to is the real address owned by the scammer?
OKX [or OKEX] is an exchange, not a mixer. The wallet in reference, Tm1z...wx9r is their hotwallet.
The post you referred to was experimenting on the "mixer" theory in a sense that someone deposited funds to the hot wallet and "mix" it through internal transfer prior to being sent to the destination address, thus [in a strict sense of what a mixer do] obscuring the fund's origin because when someone check the inbound address from the recipient side it'll show the amount is coming from a hot wallet, or if they check from the sender's side, it'll show the fund was transferred to a hot wallet. Nonetheless, OKX will still keep a record of whose address sent what amount to their hot wallet, and this is what
Potato Chips proposes to you.
Given that the address is proven to be OKX's, you can probably send an appeal to them to freeze the account. Though [also what Potato Chips proposed] the ID used for verification on that account won't necessarily be the true ID of the scammers as there are a lot of way to fake credentials.