I beg to differ. Note this is a BANK we are talking about!
Senior debt simply means that they are secured and will have first priority over others and so likely have a lower interest rate as they will have lower risk.
I suspect that the financial products they are talking about are those that can be sold to other investors so the bank may be able to offload part of the risk to others and the debt will be structured in a way to enable them to do so? These may have different terms and conditions and may have a higher interest rate?
All IMOO and pls DYOR!!