Their "debit" option works the way you think. You give only your bank card number, expiry date, and CVV.
However, their "direct debit" option requires you to enter your bank debit card number and bank password into Wise's web form. It is not a redirect to the bank website. The URL says "https://wise.com/..." when you're asked to enter that info. Wise definitely gets your bank credentials.
They have yet another option called "bill payment" in which you log into your bank account yourself and do a bill payment to Wise (and giving your Wise account number).
Both the "debit" and "bill payment" methods look secure and acceptable. But Wise charges a considerably higher fee than with their "direct debit" method. And it always seems to take a day or two for the funds to appear in your Wise account with those other methods. They really want to encourage their "direct debit" method in which they get your bank login info.