ALAC is lossless…
There is no difference between a lossless uncompressed and lossless compressed file, they are both lossless. The compressed one is just smaller.
If you compress files in a Zipfile, the files are the same once decompressed.
Can you see the problem with what you've said here?
What do you think "compression" is?
In any kind of audio compression there will be "loss". ALAC is a codec that claims the loss is not noticeable / significant for listeners. That's bold claim. They are not claiming there is no loss.
You're not going to get lossless payback through Bluetooth. You will reduce loss by using FLAC or ALAC etc using wired speakers, but there will still technically be loss.
If we get pedantic about it, the very nature of converting analogue to digital via bit sampling meaning that there will always be a certain level of loss. The aim is a level of loss that is not significant enough to be noticeable.
Bluetooth, at its current stage, will have noticeable level of loss. There's no way around that. Realistically you are not going to be using bluetooth headphones / airpods professionally a recording studio, you'll be using a pair of wired reference headphones, giving you as close to a raw audio feed as possible.
AirPods are NOT reference headphones. There is a lot of sound processing going on that cannot be turned off.
Apple, and other companies use the "lossless" as a marketing term, what they mean is higher sound quality.