We have got an inquiry for a NAND-recovery on this Macbook, but we have no experience for Apple's stuff so we are going to send the customer to another -- bigger -- DR-house. However, this doesn't stop me from learning something new

Since it's Apple, my first thought is that their NAND-protocol is a proprietary one, and probably even encrypted. So not simply a chip-off recovery by pulling the NAND and dump it. Do they (Apple) use their own controllers, or do they use standard ones? For encrypted drives, is there even a single chance for recovery, or is it the nowadays standard "bad luck, you should have backed up your data"?

https://www.it-tech.com.au/recover-data ... -computers has the basics. Unless it's removeable or there's a lifeboat it's either a case of fix the board or your SOL.

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Data Recovery Services in the UK.
https://www.usbrecovery.co.uk/

Try DFU and revive if possible, sometimes it looks dead but DFU works.
https://mrmacintosh.com/restore-macos-f ... -dfu-mode/

If not, you need to fix the board and hope short didn't hit CPU or NAND. Best place to learn is - https://boards.rossmanngroup.com/#forum.2

Fixing the board might be easier. You can then break even on the Data ... and sell the logic board to make money. ?