By your description 99% of SciFi is fantasy. You're just cherrypicking what you feel is "pure" sci-fi and what isn't.
The Expanse, The Culture novels, Foundation, etc... is just fantasy by your description. I could use your rules to pick apart most sci-fi novels and explain how they are just fantasy.
A little piece of life advice, unless you're in chemistry or metallurgy, purity tests always make you the bad guy.