If the white connector is soldered to the PC board, then it follows (as
night the day) that the cable must force-fitted to the connector. (This is
not uncommon.) Otherwise, the /cable/ would be soldered to the board (not
the connector), right?

Notice the ears? They're almost certainly holding points for pulling out the
cable. Grab them, and pull gently.

If this doesn't work, I will deny ever giving you advice. In fact, I am
disclaiming this post, a priori.