Upon determining that she had not yet learned language, linguists saw her as providing an opportunity to gain further insight into the processes controlling language acquisition skills and to test theories and hypotheses identifying critical periods during which humans learn to understand and use language.
Even given the low bar of common sense in academics someone should have realised this is not an appropriate experiment.
Hmm, I don't think they would die without hugs or communication. Nothing in the link exactly says they would die too, aside from some questionable sources from hundreds of years ago.
A human body would be able to biologically survive without hugs and communication (or even higher brain function honestly if you manage it properly).