In this scenario, we are comparing two cars, a bicycle, a jet ski, and three types of airplane. Yes, the cars are similar, within that context. Many languages, like Python and Java, do not have an array slice type. And the similarities between C++, Rust, and Go are relevant—the length is a property of the slice itself, and since the slice is passed by value, it is not modified by a function that accepts a slice as an argument, even if the objects the slice point to are modified by that function.

If you see a different context, then you misinterpreted what I wrote.

It is easy—trivial, even—to imagine scenarios where a particular “X is like Y” does not make sense. What you should do, as a reader, is try and understand what the writer means, rather than try to figure out some way to interpret a comment so that it is wrong, in your view.

The easy way out—saying “X is not like Y because of difference Z”—does not meaningfully contribute to the discussion.