Have they adjusted for percentage?
Because there are far more single mom households than single dad ones, so if you wanted to make a case for something, you could easily make it look like single mom households fared worse by sheer numbers alone.
The snippet makes no mention of single-father households. Whatever statistics might apply to single-father households are irrelevant.
The figures cited ("twice as likely," "five times as likely") refer to single-mother households and undoubtedly take two-parent households as a baseline, which is valid.
Regards,