Question about Inakustik Premium Bluetooth Receiver

If you want to listen to your non-Bluetooth TV sound through your Sony headphones via Bluetooth, then the 'Inakustik Premium Bluetooth Receiver' is the WRONG product!

Take a look at the following here:

Sennheiser BT T100 Bluetooth Audio Transmitter (Transmitter)

Hello... I bought this Bluetooth receiver so that I can stream Spotify or Qobuz, for example, to my not-so-new hi-fi system with my mobile phone/tablet. Unfortunately I don't know how this is supposed to work with the headphones, as I'm a bit "old-fashioned" technically, sorry.