It's an unfortunate placement of the statement about streaming- that should have been under the line about WiFi-6.
I know enough about BT to know that SBC and AAC are not high resolution codecs, but there are probably a lot of people who don't. Of course, if they are listening to BT music, they probably don't really care about high res codecs. I don't know if anyone buys Wiim products because of their BT capability.
BT 5.3 is good for LE devices like the remote control that stays connected and doesn't require re-pairing every time you want to use it, as long as the battery still has a charge.