People calling it "reverse engineered" are not entirely correct.

The "Low accuracy, low speed, drone" concept has not changed since the V1 was invented by the Germans. Who then went ahead and built a more modern one back in the 80s. It should look very familiar:

https://en.wikipedia.org/wiki/Dornier_DAR

It has all the bells and whistles you can recognize: GPS guidance, shitty small piston engine, lumbering speed, launched from a box truck using a small booster rocket.

See, the funny part is that the project was considered a failure because they were designed as anti-radar munitions, to just hang around until a radar transmitted and home in and destroy it. But that part of the project never figured out a good seeker.

It's just convergent evolution. That's what the design requirements imply.