yes, the BTC shown on the ETH-BTC and BTC-ETH swap is native BTC Bitcoin.
I am happy to read it because this is the major drawback of most swap bridge exchange sites because they provided wBTC which is just a token, not real Bitcoin.
In the meantime, you need to buy a copper membership, do a marketable ANN thread, and if you thinking about doing an advertisement campaign on this forum just like
Crypton Exchange,
Best Change, etc. You can contact me for both the advertisement and ANN and I will be glad to help.