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You are probably thinking AptX HD?
It doesn't. AptX lossless don't exist. Altough both AptX (supported) and AptX HD are not lossless, you don't hear the difference with the original file. It's better than MP3 320 kbps quality. AptX support 24 bit so it's potentially better than CD quality if the original file is 24 bit but it's a misconception that it is lossless.
This is probably something that is deprecated and date when the actual company was AptX. Historically the CODEC didn't have anything to do with Bluetooth and they where using it for professional stuff. Now AptX is own by Qualcomm and it's a Bluetooth CODEC only and it's not lossless . It's highest resolution version is AptX HD.
I'm actually the founder of a compagny with an upcoming AptX HD product
Being a licenced developper, trust me, there are no AptX Lossless