Whether the dismissal was abusive because the employee's illness and incapacity played a decisive role in the redundancy choice
Yes. The illness-related incapacity, itself attributable to the employer's conduct, was the determining reason for choosing the employee over his colleague; the employer failed to prove it would have dismissed him anyway.
When several motives coexist, the dismissal is abusive if the unlawful motive played a decisive role and the employer cannot show the employee would still have been dismissed without it. Here, the factual findings showed that the available/unavailable status of the two preparers was the decisive selection criterion.