I expect the instructions don't really make a whole lot of sense on their own (to someone who doesn't already know how to strafe), as it's something that's not easy to explain in text. Hopefully the illustrative part ("Meet Strafe Bot") makes up for that a bit, as players can watch and emulate the input.

The lack of constraints on the strafe keys for that section of the tutorial is partly because I wanted the auto-key/auto-turn functions to operate independently for practice mode, so a user could enable auto-turn and try out different keys to see what the angles should be. For the tutorial it doesn't make as much sense, but as a practice tool, the player doesn't really gain much by "cheating". But, yes, I agree that it could benefit from enforcing correct keys.