Is there any way to get the data off the ssd when it won't boot?

Sorry I don’t see how, as you can see you would need to remove the SSD from the logic board (Yellow marked chip)

Then you would need to find either a carrier for this chip which offers the needed I/O logic to let say a USB connection. Or you would need to get another exact same model to then carefully desolder that systems chip so you could put yours in its place. Either of these will be expensive and if you damage the chip or the alternate system that would be the end.