Hi and sorry about this!
Not intended, but expected, sort of: looking at the code, it checks for old paths. I wasn't aware of this, and it probably just wasn't reported due to luck having it affect few users, and some of those trying what you did. This probably included the overview including Ruby as a suggestion.
First and only report of which I'm aware.
I am going to put an explanation at the top of the
challenge topic for this, and will try to fix it in development later on too (probably to be safe will just tighten up the instructions).
Thanks for letting us know!
update: I checked the comment, and it explicitly specifies the options for paths
Given this and no previous reports, not going to change things, and closing the issue.