Science and technology are tools. Like means of production, they are used to serve the class that owns them. If the owner class wants "democracy", sure, they are interlinked. If they want to torture some folks, technology can be used to that end too.
Tweet being by Greta is irrelevant, an 18 year-old activist can have bad takes time to time. I saw this type of take a lot, and seeing it get liked 150k on twitter made me post it here. Disregard Indian chuds under the tweet: https://twitter.com/GretaThunberg/status/1358056887204384770
I'd say technology certainly is, but I don't really think science is a tool, at least anymore than say set theory is a tool, or the decimal expansion of τ (or 2π ≈ 6.283180) is a tool.