All drivers native to the Linux kernel are GPLv2.0 so when an out-of-tree (vendor/proprietary) non-GPLv2.0 driver (or in this case, a mixed license driver) is loaded this "taints" the kernel from a license perspective (it is no longer pure GPLv2.0). This is harmless, it has no functional or performance impact or meaning.
I don't see any errors in the log (nothing about firmware loading etc.) but the driver is old and poorly maintained so there might be errors somewhere else once networks are configured. Have you tried to configure a network in LE settings? What does "journalctl | paste" show?
NB: The BT device is USB connected (Universal Serial Bus)