Huh. Interesting. Anything specifically wrong with the article(except claims of suability? )?
In addition, the person who wrote the article seems to have confused the book version and the film version of Starship Troopers with each other. I'm also inclined to doubt his claims of anything with a race of bug aliens or skinny aliens is a rip-off of Starship Troopers, because those two tropes are fairly generic and science fiction as a genre had started before the 1950s.
i don't know about that. War of the Worlds pretty much started the alien invasion subgenre, without any real focus on the nature of the martians. even thought it was originally published in serials in 1898, it wasn't until the full republication in the late 1920s that it became really popular (and the infamous radio show). even when you had a lot of interactions with aliens in early sci-fi, you had a lot of "they're just green humans" or extra arms. the barsoom stuff is a good example (along with any other planetary romance).
existential war with a non-humanoid race is really an element of cold war culture. part of the cultural milieu of the time is the second red scare, and the association of Soviet and Maoist economic policies with collectivization, which is then likened to eusocial insects (bees and ants) that work for the good of the hive, and don't actually reproduce themselves. that the war will either result in the total destruction of one side or the other is also an element of nuclear war, which, again, something new to the 1950s.
ironically i would say heinlein's power armor is less original. specifically human-sized suits with mounted energy weapons were in short stories in 1930s, maybe earlier.