I always thought the black goo was always part of the lore/plot - In that it was engineered to try to infuse with humans to help long space travel but.... things went sideways.
It was introduced with Prometheus and had little to nothing to do with anything prior, was a big point of contention to boot.
I was big into the prior lore as a teen, bought all the books etc on top of the movies.
Scott is a bit of a spiteful bugger too, didn't like the "Alien Queen" idea that Cameron introduced in the sequel, even though it's the most sensible possible consideration to a huge ant like alien hive and was flat out awesome.
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