Permission to eat insects

Leviticus 11, verses 20-23, say:

"All flying insects that walk on all fours are to be regarded as unclean by you. 21 There are, however, some flying insects that walk on all fours that you may eat: those that have jointed legs for hopping on the ground. 22 Of these you may eat any kind of locust, katydid, cricket or grasshopper. 23 But all other flying insects that have four legs you are to regard as unclean."

Now I went to school and I know that insects have six legs.  It's kinda how insects are defined!  So does that mean I can eat all insects because none of them "walk on all fours"?

Honestly!  Who writes this rubbish!