Looks like the S10's still support LDAC. : r/galaxys10
Bluetooth audio codecs: A guide to earbud audio quality - Android Authority
Amazon.com: KZ APTX HD CSR8675 Bluetooth 5.0 IPV5 Waterproof Noise Reduction Bluetooth Module Upgrade Cable for ZSX/ZSN/ZSNPRO/ZSNProX/ZS10PRO/AS12/AS16(C Pin) : Electronics
How to check Bluetooth Codecs supported by Android phone and headphones - Smartprix Bytes