The problem with this is that it would eliminate pretty much every modern industrial manufacturer, all of whom extensively use computers, and many of which could not make the products they do without them.
What about financial companies? Most of them are heavily computerized and rely on computerized trading. Are they tech companies?
I think a distinction could be made between companies that sell tech or tech services, vs companies that use tech to make or distribute traditional products. For example, I wouldn’t consider Fed Ex to be a ‘tech’ company, but it couldn’t exist without being heavily computerized.
Is selling over the web exclusively a disqualifier? Amazon used to be a pretty traditional retailer with warehouses, save that it used the web as its sales portal. Assuming Amazon had never moved into AWS or sold Kindles, would they still be a ‘tech’ company? And if so, woild that make Barnes and Noble a tech company if they also have a web presence? The distinctions start to get fuzzy. If Tesla only sold its cars over the internet, would it be disqualified?
I still think SpaceX is a top contender. Hell, they’re building rockets the old fashioned way - welding them out of stainless steel in the desert as God and Heinlein intended.