That is correct. The vulnerability note clearly states that this only impacts "Bluetooth BR/EDR Core v5.1 and earlier". "BR/EDR" is the technical term for Classic Bluetooth; in other words not Bluetooth Low Energy.
The authors state that it impacts BR/EDR, but not exclusively so. If the standards shared enough aspects of their key negotiation protocols, then both could potentially be impacted. After scanning through the paper and the relevant details of the LE Secure pairing process, that does not appear to be the case, fortunately.