Both Bluetooth Codecs you mentioned are supported. However, Samsung doesn't support aptx HD or aptx adaptive. Turn on Developer mode to verify. If your earbuds or headphones support LDAC or aptx Samsung chooses that codec but for LDAC supported earbuds make sure when you are connected that the option is turned on in Bluetooth settings by clicking on the COG wheel next to your Bluetooth device name.
Ohhhhh thanks!! i was like why is LDAC greyed out. I forgot how i enabled it on my note 9. right. Developer options ! Im not the OP but this reply helped me. Thanks
➠ᏰᏰMG'z ᵀᴿᴵᴾ7ˢᴱᵀ √ᴱᴿᴵᶠᴵᴱᴰ⥄