That wasn't a hard question, it was one expression of the foolish idea that anything landing on the Moon would sink into the dust.
The lunar surface has been exposed to billions of years of impacts, including micrometeor impacts, which in the absence of an atmosphere, has produced a hard packed surface.
The Ranger probes sent back loads of pictures, and the later Surveyor probes made five soft landings (two others lost contact with Earth, and may or may not have made automated touchdowns) as unmanned proof of concept.
In those days scientists asked tough questions and required lots of hard evidence before jumping to conclusions.
These days they jump to conclusions in a rush to publish (and of course get government money).
Bonus: Anyone who questions their “theories” is viciously attacked as “anti science”.