In General

[Samantha293]

"But job opportunities are scarce enough in the south for young people in general, let alone those with disabilities."

Does it mean "young people as a single group", or "young people in most cases"?

[Raymott]

"But job opportunities are scarce enough in the south for young people in general, let alone those with disabilities."

Does it mean "young people as a single group", or "young people in most cases"?

No. It means "young people as a whole, (regardless of whether they have a disability, in this case)."