No it isn’t. Quoting your own source “ Live vaccines contain a weakened or attenuated form of a virus or bacteria.”. That is not what is suggested here.
Intentional infection through controlled means with the contagious virus hasn’t been used since Smallpox (as opposed to pox parties). There is no accepted term. The meaning was immediately clear to me on first reading it. It appears to be a successful reintroduction if a word for an analogous purpose. It’s even unique enough to be googleable.
Words are used to convey meaning. No one who has read more than a sentence on this topic thinks that Robin and Zvi are proposing the use of dried scabs. Vaccination is a word in common use for all diseases despite originally referring specifically to inoculation by cowpox ('vacca' = 'cow'). And it has a highly relevant parallel twin that refers specifically to the inoculation by the live dangerous virus, variolation.
I just registered to offer some perhaps not readily available information which may be relevant to your evaluation.
I heard Dave Grossman speak in person when I was in the Marines around 2005. I remember his emphasis on getting enough sleep, and less than 30 minutes at a stretch not being worthwhile, but I mostly remember my impression of a fanatic. By this I mean he did not come across as a rational person committed to introspection and careful evaluation of his own beliefs. The general opinion of a bunch of Marine combat veterans was that he was way too wound up and seemed on the verge of a nervous breakdown.
He started his talk with a story about how he won't take his granddaughter for a walk in the woods without his German Shepherd, a folding knife, and a concealed handgun. I can't say he's wrong, but I can say that whatever motivates Dave Grossman seems to lead to a view of the world that is very distant from what I think are rational behaviors.