As mentioned in the article, Andreessen's "techno-optimist manifesto" cited Marinetti - one of the coauthors of the original fascist manifesto - as one of his inspirations
His futurist political beliefs were ultimately silly IMHO, but I don't think it's fair to cast anyone who quotes his futurist writings as a fascist, let alone casting the entire movement in which the person who quoted him plays some prominent role as fascist.