Clearly, although Gore's phrasing was clumsy (and perhaps self-serving), he was not claiming that he "invented" the Internet (in the sense of having designed or implemented it), but that he was responsible, in an economic and legislative sense, for fostering the development the technology that we now know as the Internet.
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If President Eisenhower had said in the mid-1960s that he, while President, "created" the Interstate Highway System, we would not have seen dozens and dozens of editorials lampooning him for claiming he "invented" the concept of highways or implying that he personally went out and dug ditches across the country to help build the roadway. Everyone would have understood that Ike meant he was a driving force behind the legislation that created the highway system, and this was the very same concept Al Gore was expressing about himself with his Internet statement.
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It is true, though, that Gore was popularizing the term "information superhighway" in the early 1990s (although he did not, as is often claimed by others, coin the phrase himself) when few people outside academia or the computer/defense industries had heard of the Internet, and he sponsored the 1988 National High-Performance Computer Act (which established a national computing plan and helped link universities and libraries via a shared network) and cosponsored the Information Infrastructure and Technology Act of 1992 (which opened the Internet to commercial traffic).